diff --git a/SunnyUI/Forms/UIForm.cs b/SunnyUI/Forms/UIForm.cs
index 5ba4d923..f2a3e0fd 100644
--- a/SunnyUI/Forms/UIForm.cs
+++ b/SunnyUI/Forms/UIForm.cs
@@ -1971,9 +1971,9 @@ namespace Sunny.UI
         /// <param name="msg">信息</param>
         /// <param name="showMask">显示遮罩层</param>
         /// <returns>结果</returns>
-        public bool ShowAskDialog(string msg, bool showMask = false)
+        public bool ShowAskDialog(string msg, UIMessageDialogButtons defaultButton = UIMessageDialogButtons.Ok, bool showMask = false)
         {
-            return UIMessageDialog.ShowMessageDialog(msg, UILocalize.AskTitle, true, UIStyle.Blue, showMask, true);
+            return UIMessageDialog.ShowMessageDialog(msg, UILocalize.AskTitle, true, UIStyle.Blue, showMask, true, defaultButton);
         }
 
         /// <summary>
@@ -2032,9 +2032,9 @@ namespace Sunny.UI
         /// <param name="style">主题</param>
         /// <param name="showMask">显示遮罩层</param>
         /// <returns>结果</returns>
-        public bool ShowAskDialog(string title, string msg, UIStyle style = UIStyle.Blue, bool showMask = false)
+        public bool ShowAskDialog(string title, string msg, UIMessageDialogButtons defaultButton = UIMessageDialogButtons.Ok, UIStyle style = UIStyle.Blue, bool showMask = false)
         {
-            return UIMessageDialog.ShowMessageDialog(msg, title, true, style, showMask, true);
+            return UIMessageDialog.ShowMessageDialog(msg, title, true, style, showMask, true, defaultButton);
         }
 
         /// <summary>
diff --git a/SunnyUI/Forms/UIFormHelper.cs b/SunnyUI/Forms/UIFormHelper.cs
index 798674c1..a29d556d 100644
--- a/SunnyUI/Forms/UIFormHelper.cs
+++ b/SunnyUI/Forms/UIFormHelper.cs
@@ -23,6 +23,7 @@
  * 2021-12-13: V3.0.9 增加全屏遮罩，Form的ShowDialogWithMask()扩展方法
  * 2022-07-17: V3.2.1 解决ShowNotifier打开多个，全部关闭时出错的问题
  * 2023-07-27: V3.4.1 默认提示弹窗TopMost为true
+ * 2023-07-27: V3.4.1 提问弹窗增加可选择默认是确认或者取消按钮的选择
 ******************************************************************************/
 
 using System;
@@ -86,52 +87,7 @@ namespace Sunny.UI
         /// <param name="style">主题</param>
         public static void ShowSuccessDialog(this Form form, string msg, UIStyle style = UIStyle.Green)
         {
-            form.ShowMessageDialog(msg, UILocalize.SuccessTitle, false, style);
-        }
-
-        /// <summary>
-        /// 信息提示框
-        /// </summary>
-        /// <param name="form">窗体</param>
-        /// <param name="msg">信息</param>
-        /// <param name="style">主题</param>
-        public static void ShowInfoDialog(this Form form, string msg, UIStyle style = UIStyle.Gray)
-        {
-            form.ShowMessageDialog(msg, UILocalize.InfoTitle, false, style);
-        }
-
-        /// <summary>
-        /// 警告信息提示框
-        /// </summary>
-        /// <param name="form">窗体</param>
-        /// <param name="msg">信息</param>
-        /// <param name="style">主题</param>
-        public static void ShowWarningDialog(this Form form, string msg, UIStyle style = UIStyle.Orange)
-        {
-            form.ShowMessageDialog(msg, UILocalize.WarningTitle, false, style);
-        }
-
-        /// <summary>
-        /// 错误信息提示框
-        /// </summary>
-        /// <param name="form">窗体</param>
-        /// <param name="msg">信息</param>
-        /// <param name="style">主题</param>
-        public static void ShowErrorDialog(this Form form, string msg, UIStyle style = UIStyle.Red)
-        {
-            form.ShowMessageDialog(msg, UILocalize.ErrorTitle, false, style);
-        }
-
-        /// <summary>
-        /// 确认信息提示框
-        /// </summary>
-        /// <param name="form">窗体</param>
-        /// <param name="msg">信息</param>
-        /// <param name="style"></param>
-        /// <returns>结果</returns>
-        public static bool ShowAskDialog(this Form form, string msg, UIStyle style = UIStyle.Blue)
-        {
-            return form.ShowMessageDialog(msg, UILocalize.AskTitle, true, style);
+            form.ShowSuccessDialog(UILocalize.SuccessTitle, msg, style);
         }
 
         /// <summary>
@@ -146,6 +102,17 @@ namespace Sunny.UI
             form.ShowMessageDialog(msg, title, false, style);
         }
 
+        /// <summary>
+        /// 信息提示框
+        /// </summary>
+        /// <param name="form">窗体</param>
+        /// <param name="msg">信息</param>
+        /// <param name="style">主题</param>
+        public static void ShowInfoDialog(this Form form, string msg, UIStyle style = UIStyle.Gray)
+        {
+            form.ShowInfoDialog(UILocalize.InfoTitle, msg, style);
+        }
+
         /// <summary>
         /// 信息提示框
         /// </summary>
@@ -158,6 +125,17 @@ namespace Sunny.UI
             form.ShowMessageDialog(msg, title, false, style);
         }
 
+        /// <summary>
+        /// 警告信息提示框
+        /// </summary>
+        /// <param name="form">窗体</param>
+        /// <param name="msg">信息</param>
+        /// <param name="style">主题</param>
+        public static void ShowWarningDialog(this Form form, string msg, UIStyle style = UIStyle.Orange)
+        {
+            form.ShowWarningDialog(UILocalize.WarningTitle, msg, style);
+        }
+
         /// <summary>
         /// 警告信息提示框
         /// </summary>
@@ -170,6 +148,17 @@ namespace Sunny.UI
             form.ShowMessageDialog(msg, title, false, style);
         }
 
+        /// <summary>
+        /// 错误信息提示框
+        /// </summary>
+        /// <param name="form">窗体</param>
+        /// <param name="msg">信息</param>
+        /// <param name="style">主题</param>
+        public static void ShowErrorDialog(this Form form, string msg, UIStyle style = UIStyle.Red)
+        {
+            form.ShowErrorDialog(UILocalize.ErrorTitle, msg, style);
+        }
+
         /// <summary>
         /// 错误信息提示框
         /// </summary>
@@ -182,6 +171,18 @@ namespace Sunny.UI
             form.ShowMessageDialog(msg, title, false, style);
         }
 
+        /// <summary>
+        /// 确认信息提示框
+        /// </summary>
+        /// <param name="form">窗体</param>
+        /// <param name="msg">信息</param>
+        /// <param name="style"></param>
+        /// <returns>结果</returns>
+        public static bool ShowAskDialog(this Form form, string msg, UIMessageDialogButtons defaultButton = UIMessageDialogButtons.Ok, UIStyle style = UIStyle.Blue)
+        {
+            return form.ShowAskDialog(UILocalize.AskTitle, msg, defaultButton, style);
+        }
+
         /// <summary>
         /// 确认信息提示框
         /// </summary>
@@ -190,7 +191,7 @@ namespace Sunny.UI
         /// <param name="msg">信息</param>
         /// <param name="style"></param>
         /// <returns>结果</returns>
-        public static bool ShowAskDialog(this Form form, string title, string msg, UIStyle style = UIStyle.Blue)
+        public static bool ShowAskDialog(this Form form, string title, string msg, UIMessageDialogButtons defaultButton = UIMessageDialogButtons.Ok, UIStyle style = UIStyle.Blue)
         {
             return form.ShowMessageDialog(msg, title, true, style);
         }
@@ -216,11 +217,21 @@ namespace Sunny.UI
         /// <param name="showMask">显示遮罩层</param>
         /// <param name="topMost">置顶</param>
         /// <returns>结果</returns>
-        public static bool ShowMessageDialog(string message, string title, bool showCancelButton, UIStyle style, bool showMask = true, bool topMost = true)
+        public static bool ShowMessageDialog(string message, string title, bool showCancelButton, UIStyle style, bool showMask = true, bool topMost = true, UIMessageDialogButtons defaultButton = UIMessageDialogButtons.Ok)
         {
             Point pt = SystemEx.GetCursorPos();
             Rectangle screen = Screen.GetBounds(pt);
             UIMessageForm frm = new UIMessageForm();
+
+            if (showCancelButton)
+            {
+                frm.DefaultButton = defaultButton;
+            }
+            else
+            {
+                frm.DefaultButton = UIMessageDialogButtons.Ok;
+            }
+
             frm.StartPosition = FormStartPosition.CenterScreen;
             frm.ShowMessage(message, title, showCancelButton, style);
             frm.ShowInTaskbar = false;
@@ -237,6 +248,12 @@ namespace Sunny.UI
         }
     }
 
+    public enum UIMessageDialogButtons
+    {
+        Ok,
+        Cancel
+    }
+
     public static class UIMessageBox
     {
         public static void Show(string text, bool showMask = true, bool topMost = true)
diff --git a/SunnyUI/Forms/UIMessageForm.Designer.cs b/SunnyUI/Forms/UIMessageForm.Designer.cs
index 98851e97..ba003e0a 100644
--- a/SunnyUI/Forms/UIMessageForm.Designer.cs
+++ b/SunnyUI/Forms/UIMessageForm.Designer.cs
@@ -28,85 +28,82 @@
         /// </summary>
         private void InitializeComponent()
         {
-            this.btnCancel = new Sunny.UI.UIButton();
-            this.btnOK = new Sunny.UI.UIButton();
-            this.lbMsg = new Sunny.UI.UIRichTextBox();
-            this.SuspendLayout();
+            btnCancel = new UIButton();
+            btnOK = new UIButton();
+            lbMsg = new UIRichTextBox();
+            SuspendLayout();
             // 
             // btnCancel
             // 
-            this.btnCancel.BackColor = System.Drawing.Color.Transparent;
-            this.btnCancel.Cursor = System.Windows.Forms.Cursors.Hand;
-            this.btnCancel.Font = new System.Drawing.Font("微软雅黑", 12F);
-            this.btnCancel.Location = new System.Drawing.Point(224, 220);
-            this.btnCancel.Margin = new System.Windows.Forms.Padding(0);
-            this.btnCancel.MinimumSize = new System.Drawing.Size(1, 1);
-            this.btnCancel.Name = "btnCancel";
-            this.btnCancel.Size = new System.Drawing.Size(224, 48);
-            this.btnCancel.TabIndex = 6;
-            this.btnCancel.Text = "取消";
-            this.btnCancel.TipsFont = new System.Drawing.Font("微软雅黑", 9F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(134)));
-            this.btnCancel.TipsText = null;
-            this.btnCancel.ZoomScaleRect = new System.Drawing.Rectangle(0, 0, 0, 0);
-            this.btnCancel.Click += new System.EventHandler(this.btnCancel_Click);
-            this.btnCancel.MouseEnter += new System.EventHandler(this.btnOK_MouseEnter);
-            this.btnCancel.MouseLeave += new System.EventHandler(this.btnOK_MouseLeave);
+            btnCancel.BackColor = System.Drawing.Color.Transparent;
+            btnCancel.Cursor = System.Windows.Forms.Cursors.Hand;
+            btnCancel.Font = new System.Drawing.Font("微软雅黑", 12F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point);
+            btnCancel.Location = new System.Drawing.Point(224, 220);
+            btnCancel.Margin = new System.Windows.Forms.Padding(0);
+            btnCancel.MinimumSize = new System.Drawing.Size(1, 1);
+            btnCancel.Name = "btnCancel";
+            btnCancel.Size = new System.Drawing.Size(224, 48);
+            btnCancel.TabIndex = 6;
+            btnCancel.Text = "取消";
+            btnCancel.TipsFont = new System.Drawing.Font("微软雅黑", 9F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point);
+            btnCancel.TipsText = null;
+            btnCancel.Click += btnCancel_Click;
+            btnCancel.MouseEnter += btnOK_MouseEnter;
+            btnCancel.MouseLeave += btnOK_MouseLeave;
             // 
             // btnOK
             // 
-            this.btnOK.BackColor = System.Drawing.Color.Transparent;
-            this.btnOK.Cursor = System.Windows.Forms.Cursors.Hand;
-            this.btnOK.Font = new System.Drawing.Font("微软雅黑", 12F);
-            this.btnOK.Location = new System.Drawing.Point(2, 220);
-            this.btnOK.Margin = new System.Windows.Forms.Padding(0);
-            this.btnOK.MinimumSize = new System.Drawing.Size(1, 1);
-            this.btnOK.Name = "btnOK";
-            this.btnOK.Size = new System.Drawing.Size(223, 48);
-            this.btnOK.TabIndex = 5;
-            this.btnOK.Text = "确定";
-            this.btnOK.TipsFont = new System.Drawing.Font("微软雅黑", 9F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(134)));
-            this.btnOK.TipsText = null;
-            this.btnOK.ZoomScaleRect = new System.Drawing.Rectangle(0, 0, 0, 0);
-            this.btnOK.Click += new System.EventHandler(this.btnOK_Click);
-            this.btnOK.MouseEnter += new System.EventHandler(this.btnOK_MouseEnter);
-            this.btnOK.MouseLeave += new System.EventHandler(this.btnOK_MouseLeave);
+            btnOK.BackColor = System.Drawing.Color.Transparent;
+            btnOK.Cursor = System.Windows.Forms.Cursors.Hand;
+            btnOK.Font = new System.Drawing.Font("微软雅黑", 12F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point);
+            btnOK.Location = new System.Drawing.Point(2, 220);
+            btnOK.Margin = new System.Windows.Forms.Padding(0);
+            btnOK.MinimumSize = new System.Drawing.Size(1, 1);
+            btnOK.Name = "btnOK";
+            btnOK.Size = new System.Drawing.Size(223, 48);
+            btnOK.TabIndex = 5;
+            btnOK.Text = "确定";
+            btnOK.TipsFont = new System.Drawing.Font("微软雅黑", 9F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point);
+            btnOK.TipsText = null;
+            btnOK.Click += btnOK_Click;
+            btnOK.MouseEnter += btnOK_MouseEnter;
+            btnOK.MouseLeave += btnOK_MouseLeave;
             // 
             // lbMsg
             // 
-            this.lbMsg.BackColor = System.Drawing.Color.FromArgb(((int)(((byte)(235)))), ((int)(((byte)(243)))), ((int)(((byte)(255)))));
-            this.lbMsg.FillColor = System.Drawing.Color.White;
-            this.lbMsg.Font = new System.Drawing.Font("微软雅黑", 12F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(134)));
-            this.lbMsg.Location = new System.Drawing.Point(14, 50);
-            this.lbMsg.Margin = new System.Windows.Forms.Padding(4, 5, 4, 5);
-            this.lbMsg.MinimumSize = new System.Drawing.Size(1, 1);
-            this.lbMsg.Name = "lbMsg";
-            this.lbMsg.Padding = new System.Windows.Forms.Padding(2);
-            this.lbMsg.RadiusSides = Sunny.UI.UICornerRadiusSides.None;
-            this.lbMsg.ReadOnly = true;
-            this.lbMsg.RectSides = System.Windows.Forms.ToolStripStatusLabelBorderSides.None;
-            this.lbMsg.ShowText = false;
-            this.lbMsg.Size = new System.Drawing.Size(422, 158);
-            this.lbMsg.TabIndex = 7;
-            this.lbMsg.TextAlignment = System.Drawing.ContentAlignment.MiddleCenter;
-            this.lbMsg.ZoomScaleRect = new System.Drawing.Rectangle(0, 0, 0, 0);
+            lbMsg.BackColor = System.Drawing.Color.FromArgb(235, 243, 255);
+            lbMsg.FillColor = System.Drawing.Color.White;
+            lbMsg.Font = new System.Drawing.Font("微软雅黑", 12F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point);
+            lbMsg.Location = new System.Drawing.Point(14, 50);
+            lbMsg.Margin = new System.Windows.Forms.Padding(4, 5, 4, 5);
+            lbMsg.MinimumSize = new System.Drawing.Size(1, 1);
+            lbMsg.Name = "lbMsg";
+            lbMsg.Padding = new System.Windows.Forms.Padding(2);
+            lbMsg.RadiusSides = UICornerRadiusSides.None;
+            lbMsg.ReadOnly = true;
+            lbMsg.RectSides = System.Windows.Forms.ToolStripStatusLabelBorderSides.None;
+            lbMsg.ShowText = false;
+            lbMsg.Size = new System.Drawing.Size(422, 158);
+            lbMsg.TabIndex = 7;
+            lbMsg.TextAlignment = System.Drawing.ContentAlignment.MiddleCenter;
             // 
             // UIMessageForm
             // 
-            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.None;
-            this.ClientSize = new System.Drawing.Size(450, 270);
-            this.Controls.Add(this.lbMsg);
-            this.Controls.Add(this.btnCancel);
-            this.Controls.Add(this.btnOK);
-            this.EscClose = true;
-            this.MaximizeBox = false;
-            this.MinimizeBox = false;
-            this.Name = "UIMessageForm";
-            this.Padding = new System.Windows.Forms.Padding(1, 35, 1, 3);
-            this.ShowInTaskbar = false;
-            this.Text = "UIMsgBox";
-            this.ZoomScaleRect = new System.Drawing.Rectangle(15, 15, 450, 270);
-            this.ResumeLayout(false);
-
+            AutoScaleMode = System.Windows.Forms.AutoScaleMode.None;
+            ClientSize = new System.Drawing.Size(450, 270);
+            Controls.Add(lbMsg);
+            Controls.Add(btnCancel);
+            Controls.Add(btnOK);
+            EscClose = true;
+            MaximizeBox = false;
+            MinimizeBox = false;
+            Name = "UIMessageForm";
+            Padding = new System.Windows.Forms.Padding(1, 35, 1, 3);
+            ShowInTaskbar = false;
+            Text = "UIMsgBox";
+            ZoomScaleRect = new System.Drawing.Rectangle(15, 15, 450, 270);
+            Shown += UIMessageForm_Shown;
+            ResumeLayout(false);
         }
 
         #endregion
diff --git a/SunnyUI/Forms/UIMessageForm.cs b/SunnyUI/Forms/UIMessageForm.cs
index 4c01a8f4..c990c68e 100644
--- a/SunnyUI/Forms/UIMessageForm.cs
+++ b/SunnyUI/Forms/UIMessageForm.cs
@@ -100,7 +100,10 @@ namespace Sunny.UI
         protected override void DoEnter()
         {
             base.DoEnter();
-            btnOK_Click(null, null);
+            if (!ShowCancel)
+            {
+                btnOK_Click(null, null);
+            }
         }
 
         private void btnOK_Click(object sender, EventArgs e)
@@ -125,13 +128,6 @@ namespace Sunny.UI
         {
             base.SetStyleColor(uiColor);
 
-            if (btnOK != null)
-            {
-                btnOK.FillColor = BackColor;
-                btnOK.RectColor = Color.FromArgb(36, uiColor.ButtonRectColor);
-                btnOK.ForeColor = uiColor.LabelForeColor;
-            }
-
             if (btnCancel != null)
             {
                 btnCancel.FillColor = BackColor;
@@ -139,6 +135,13 @@ namespace Sunny.UI
                 btnCancel.ForeColor = uiColor.LabelForeColor;
             }
 
+            if (btnOK != null)
+            {
+                btnOK.FillColor = BackColor;
+                btnOK.RectColor = Color.FromArgb(36, uiColor.ButtonRectColor);
+                btnOK.ForeColor = uiColor.LabelForeColor;
+            }
+
             if (lbMsg != null)
             {
                 lbMsg.ForeColor = uiColor.LabelForeColor;
@@ -149,6 +152,8 @@ namespace Sunny.UI
             }
         }
 
+        public UIMessageDialogButtons DefaultButton { get; set; } = UIMessageDialogButtons.Ok;
+
         private void btnOK_MouseEnter(object sender, EventArgs e)
         {
             //((UIButton)sender).RadiusSides = UICornerRadiusSides.All;
@@ -175,5 +180,17 @@ namespace Sunny.UI
             //btnOK.ShowFocusLine = btnCancel.ShowFocusLine = showCancel;
             btnOK.ShowFocusColor = btnCancel.ShowFocusColor = showCancel;
         }
+
+        private void UIMessageForm_Shown(object sender, EventArgs e)
+        {
+            if (!ShowCancel || DefaultButton == UIMessageDialogButtons.Ok)
+            {
+                btnOK.Focus();
+            }
+            else
+            {
+                btnCancel.Focus();
+            }
+        }
     }
 }
\ No newline at end of file
diff --git a/SunnyUI/Forms/UIMessageForm.resx b/SunnyUI/Forms/UIMessageForm.resx
index 1af7de15..a395bffc 100644
--- a/SunnyUI/Forms/UIMessageForm.resx
+++ b/SunnyUI/Forms/UIMessageForm.resx
@@ -1,24 +1,24 @@
 <?xml version="1.0" encoding="utf-8"?>
 <root>
-  <!-- 
+  <!--
     Microsoft ResX Schema 
-    
+
     Version 2.0
-    
-    The primary goals of this format is to allow a simple XML format 
-    that is mostly human readable. The generation and parsing of the 
-    various data types are done through the TypeConverter classes 
+
+    The primary goals of this format is to allow a simple XML format
+    that is mostly human readable. The generation and parsing of the
+    various data types are done through the TypeConverter classes
     associated with the data types.
-    
+
     Example:
-    
+
     ... ado.net/XML headers & schema ...
     <resheader name="resmimetype">text/microsoft-resx</resheader>
     <resheader name="version">2.0</resheader>
     <resheader name="reader">System.Resources.ResXResourceReader, System.Windows.Forms, ...</resheader>
     <resheader name="writer">System.Resources.ResXResourceWriter, System.Windows.Forms, ...</resheader>
     <data name="Name1"><value>this is my long string</value><comment>this is a comment</comment></data>
-    <data name="Color1" type="System.Drawing.Color, System.Drawing">Blue</data>
+    <data name="Color1" type="System.Drawing.Color, System.Drawing"">Blue</data>
     <data name="Bitmap1" mimetype="application/x-microsoft.net.object.binary.base64">
         <value>[base64 mime encoded serialized .NET Framework object]</value>
     </data>
@@ -26,36 +26,36 @@
         <value>[base64 mime encoded string representing a byte array form of the .NET Framework object]</value>
         <comment>This is a comment</comment>
     </data>
-                
-    There are any number of "resheader" rows that contain simple 
+
+    There are any number of "resheader" rows that contain simple
     name/value pairs.
-    
-    Each data row contains a name, and value. The row also contains a 
-    type or mimetype. Type corresponds to a .NET class that support 
-    text/value conversion through the TypeConverter architecture. 
-    Classes that don't support this are serialized and stored with the 
+
+    Each data row contains a name, and value. The row also contains a
+    type or mimetype. Type corresponds to a .NET class that support
+    text/value conversion through the TypeConverter architecture.
+    Classes that don't support this are serialized and stored with the
     mimetype set.
-    
-    The mimetype is used for serialized objects, and tells the 
-    ResXResourceReader how to depersist the object. This is currently not 
+
+    The mimetype is used for serialized objects, and tells the
+    ResXResourceReader how to depersist the object. This is currently not
     extensible. For a given mimetype the value must be set accordingly:
-    
-    Note - application/x-microsoft.net.object.binary.base64 is the format 
-    that the ResXResourceWriter will generate, however the reader can 
+
+    Note - application/x-microsoft.net.object.binary.base64 is the format
+    that the ResXResourceWriter will generate, however the reader can
     read any of the formats listed below.
-    
+
     mimetype: application/x-microsoft.net.object.binary.base64
-    value   : The object must be serialized with 
+    value   : The object must be serialized with
             : System.Runtime.Serialization.Formatters.Binary.BinaryFormatter
             : and then encoded with base64 encoding.
     
     mimetype: application/x-microsoft.net.object.soap.base64
-    value   : The object must be serialized with 
+    value   : The object must be serialized with
             : System.Runtime.Serialization.Formatters.Soap.SoapFormatter
             : and then encoded with base64 encoding.
 
     mimetype: application/x-microsoft.net.object.bytearray.base64
-    value   : The object must be serialized into a byte array 
+    value   : The object must be serialized into a byte array
             : using a System.ComponentModel.TypeConverter
             : and then encoded with base64 encoding.
     -->
diff --git a/SunnyUI/Frames/UIPage.cs b/SunnyUI/Frames/UIPage.cs
index a19ffb5f..874725ff 100644
--- a/SunnyUI/Frames/UIPage.cs
+++ b/SunnyUI/Frames/UIPage.cs
@@ -1233,9 +1233,9 @@ namespace Sunny.UI
         /// <param name="msg">信息</param>
         /// <param name="showMask">显示遮罩层</param>
         /// <returns>结果</returns>
-        public bool ShowAskDialog(string msg, bool showMask = false)
+        public bool ShowAskDialog(string msg, UIMessageDialogButtons defaultButton = UIMessageDialogButtons.Ok, bool showMask = false)
         {
-            return UIMessageDialog.ShowMessageDialog(msg, UILocalize.AskTitle, true, UIStyle.Blue, showMask, true);
+            return UIMessageDialog.ShowMessageDialog(msg, UILocalize.AskTitle, true, UIStyle.Blue, showMask, true, defaultButton);
         }
 
         /// <summary>
@@ -1294,9 +1294,9 @@ namespace Sunny.UI
         /// <param name="style">主题</param>
         /// <param name="showMask">显示遮罩层</param>
         /// <returns>结果</returns>
-        public bool ShowAskDialog(string title, string msg, UIStyle style = UIStyle.Blue, bool showMask = false)
+        public bool ShowAskDialog(string title, string msg, UIMessageDialogButtons defaultButton = UIMessageDialogButtons.Ok, UIStyle style = UIStyle.Blue, bool showMask = false)
         {
-            return UIMessageDialog.ShowMessageDialog(msg, title, true, style, showMask, true);
+            return UIMessageDialog.ShowMessageDialog(msg, title, true, style, showMask, true, defaultButton);
         }
 
         /// <summary>