C# WinForms Designer在更改控件时删除事件

编辑：我发现了问题并将答案发布在下面

我在WinForms中有一些自定义控件，我遇到了一个问题，在我的窗体上，当我在设计器中更改控件时（例如将其向左移动一个像素，然后再向后移动），应用于控件的每个事件都会从设计器代码中删除

例如，使用自定义按钮，我没有对单击事件执行任何特殊操作。在继承WinForms Button类的类中，我甚至没有触及该属性，但当表单中的任何一个控件发生更改时，buttons click事件将被删除

我还没有找到任何与设计器在线删除事件相关的内容，在我的代码中也没有看到任何会导致这种情况的内容

下面是自定义按钮的代码，如果有帮助的话：

CustomVisualButton.cs

using System;
using System.ComponentModel;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Drawing.Text;
using System.Windows.Forms;

namespace CustomVisual {

    [Designer( typeof( CustomVisualControlDesigner ) )]
    public class CustomVisualButton : Button, CustomVisualControlInterface {

        private Boolean _IsHovering = false;

        #region Properties

        [DesignerSerializationVisibility( DesignerSerializationVisibility.Hidden ), Browsable( false )]
        public override Font Font {
            get {
                return base.Font;
            }
            set {
                base.Font = value;
            }
        }

        #endregion

        #region Constructor

        public CustomVisualButton( ) {

            DoubleBuffered = true;
            Font = CustomVisualPalette.DefaultFont;
            SetStyle( ControlStyles.UserPaint, true );
            SetStyle( ControlStyles.SupportsTransparentBackColor, true );
        }

        #endregion

        #region Overrides

        protected override void OnMouseEnter( EventArgs Args ) {

            base.OnMouseEnter( Args );
            _IsHovering = true;
            Cursor = Cursors.Hand;
        }

        protected override void OnMouseLeave( EventArgs Args ) {

            base.OnMouseLeave( Args );
            _IsHovering = false;
            Cursor = Cursors.Default;
        }

        protected override void OnPaint( PaintEventArgs Args ) {
            // long paint method
        }

        protected override void OnResize( EventArgs Args ) {

            base.OnResize( Args );

            if ( CustomVisualPalette.FORCE_HEIGHT > 0 ) {

                Height = CustomVisualPalette.FORCE_HEIGHT;
            }
        }

        #endregion

    }

}

namespace CustomVisual {

    public interface CustomVisualControlInterface {
    }

}

using System.ComponentModel;
using System.ComponentModel.Design;
using System.Windows.Forms;
using System.Windows.Forms.Design;
using System.Drawing;
using System;

namespace CustomVisual {


    public class CustomVisualControlDesigner : ControlDesigner {

        private DesignerActionListCollection _ActionLists;

        public override DesignerActionListCollection ActionLists {
            get {
                if ( null == _ActionLists ) {
                    _ActionLists = new DesignerActionListCollection( );
                    _ActionLists.Add( new CustomVisualControlActionList( this.Component ) );
                }
                return _ActionLists;
            }
        }

    }

    public class CustomVisualControlActionList : DesignerActionList {

        private Control _Control;
        private DesignerActionUIService _Service = null;

        public CustomVisualControlInterface AlignSubject { get; set; }

        public CustomVisualControlActionList( IComponent Component )
            : base( Component ) {

            _Control = Component as Control;
            _Service = GetService( typeof( DesignerActionUIService ) ) as DesignerActionUIService;

        }

        public void RefreshDesigner( ) {

            _Service.HideUI( _Control );
            _Service.Refresh( _Control );
            _Service.ShowUI( _Control );
        }

        public Int32 SyncHeight( Control Source, Control Destination ) {
            // vertical alignment for elements of possible different height
        }

        public void MatchWidth( ) {
            // makes element width same as subject width
        }

        public void PlaceUnder( ) {
            // places element under subject
        }

        public void PlaceCloseUnder( ) {
            // places element close under subject
        }

        public void PlaceRight( ) {
            // places element right of subject
        }

        public void PlaceCloseRight( ) {
            // places element close right of subject
        }

        public void PlaceAbove( ) {
            // places element above subject
        }

        public void PlaceLeft( ) {
            // places element left of subject
        }

        public void AnchorType1( ) {
            // code to align to certain spot
        }

        public override DesignerActionItemCollection GetSortedActionItems( ) {

            DesignerActionItemCollection Items = new DesignerActionItemCollection( );
            Items.Add( new DesignerActionPropertyItem( "AlignSubject", "Subject", "alignment" ) );
            Items.Add( new DesignerActionMethodItem( this, "MatchWidth", "match width", "alignment" ) );
            Items.Add( new DesignerActionMethodItem( this, "PlaceAbove", "place above", "alignment" ) );
            Items.Add( new DesignerActionMethodItem( this, "PlaceRight", "place right", "alignment" ) );
            Items.Add( new DesignerActionMethodItem( this, "PlaceCloseRight", "place close right", "alignment" ) );
            Items.Add( new DesignerActionMethodItem( this, "PlaceUnder", "place under", "alignment" ) );
            Items.Add( new DesignerActionMethodItem( this, "PlaceCloseUnder", "place close under", "alignment" ) );
            Items.Add( new DesignerActionMethodItem( this, "PlaceLeft", "place left", "alignment" ) );
            Items.Add( new DesignerActionMethodItem( this, "AnchorType1", "anchor type 1", "anchors" ) );
            return Items;

        }

    }
}

CustomVisualControlInterface.cs

using System;
using System.ComponentModel;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Drawing.Text;
using System.Windows.Forms;

namespace CustomVisual {

    [Designer( typeof( CustomVisualControlDesigner ) )]
    public class CustomVisualButton : Button, CustomVisualControlInterface {

        private Boolean _IsHovering = false;

        #region Properties

        [DesignerSerializationVisibility( DesignerSerializationVisibility.Hidden ), Browsable( false )]
        public override Font Font {
            get {
                return base.Font;
            }
            set {
                base.Font = value;
            }
        }

        #endregion

        #region Constructor

        public CustomVisualButton( ) {

            DoubleBuffered = true;
            Font = CustomVisualPalette.DefaultFont;
            SetStyle( ControlStyles.UserPaint, true );
            SetStyle( ControlStyles.SupportsTransparentBackColor, true );
        }

        #endregion

        #region Overrides

        protected override void OnMouseEnter( EventArgs Args ) {

            base.OnMouseEnter( Args );
            _IsHovering = true;
            Cursor = Cursors.Hand;
        }

        protected override void OnMouseLeave( EventArgs Args ) {

            base.OnMouseLeave( Args );
            _IsHovering = false;
            Cursor = Cursors.Default;
        }

        protected override void OnPaint( PaintEventArgs Args ) {
            // long paint method
        }

        protected override void OnResize( EventArgs Args ) {

            base.OnResize( Args );

            if ( CustomVisualPalette.FORCE_HEIGHT > 0 ) {

                Height = CustomVisualPalette.FORCE_HEIGHT;
            }
        }

        #endregion

    }

}

namespace CustomVisual {

    public interface CustomVisualControlInterface {
    }

}

using System.ComponentModel;
using System.ComponentModel.Design;
using System.Windows.Forms;
using System.Windows.Forms.Design;
using System.Drawing;
using System;

namespace CustomVisual {


    public class CustomVisualControlDesigner : ControlDesigner {

        private DesignerActionListCollection _ActionLists;

        public override DesignerActionListCollection ActionLists {
            get {
                if ( null == _ActionLists ) {
                    _ActionLists = new DesignerActionListCollection( );
                    _ActionLists.Add( new CustomVisualControlActionList( this.Component ) );
                }
                return _ActionLists;
            }
        }

    }

    public class CustomVisualControlActionList : DesignerActionList {

        private Control _Control;
        private DesignerActionUIService _Service = null;

        public CustomVisualControlInterface AlignSubject { get; set; }

        public CustomVisualControlActionList( IComponent Component )
            : base( Component ) {

            _Control = Component as Control;
            _Service = GetService( typeof( DesignerActionUIService ) ) as DesignerActionUIService;

        }

        public void RefreshDesigner( ) {

            _Service.HideUI( _Control );
            _Service.Refresh( _Control );
            _Service.ShowUI( _Control );
        }

        public Int32 SyncHeight( Control Source, Control Destination ) {
            // vertical alignment for elements of possible different height
        }

        public void MatchWidth( ) {
            // makes element width same as subject width
        }

        public void PlaceUnder( ) {
            // places element under subject
        }

        public void PlaceCloseUnder( ) {
            // places element close under subject
        }

        public void PlaceRight( ) {
            // places element right of subject
        }

        public void PlaceCloseRight( ) {
            // places element close right of subject
        }

        public void PlaceAbove( ) {
            // places element above subject
        }

        public void PlaceLeft( ) {
            // places element left of subject
        }

        public void AnchorType1( ) {
            // code to align to certain spot
        }

        public override DesignerActionItemCollection GetSortedActionItems( ) {

            DesignerActionItemCollection Items = new DesignerActionItemCollection( );
            Items.Add( new DesignerActionPropertyItem( "AlignSubject", "Subject", "alignment" ) );
            Items.Add( new DesignerActionMethodItem( this, "MatchWidth", "match width", "alignment" ) );
            Items.Add( new DesignerActionMethodItem( this, "PlaceAbove", "place above", "alignment" ) );
            Items.Add( new DesignerActionMethodItem( this, "PlaceRight", "place right", "alignment" ) );
            Items.Add( new DesignerActionMethodItem( this, "PlaceCloseRight", "place close right", "alignment" ) );
            Items.Add( new DesignerActionMethodItem( this, "PlaceUnder", "place under", "alignment" ) );
            Items.Add( new DesignerActionMethodItem( this, "PlaceCloseUnder", "place close under", "alignment" ) );
            Items.Add( new DesignerActionMethodItem( this, "PlaceLeft", "place left", "alignment" ) );
            Items.Add( new DesignerActionMethodItem( this, "AnchorType1", "anchor type 1", "anchors" ) );
            return Items;

        }

    }
}

CustomVisualControlDesigner.cs

using System;
using System.ComponentModel;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Drawing.Text;
using System.Windows.Forms;

namespace CustomVisual {

    [Designer( typeof( CustomVisualControlDesigner ) )]
    public class CustomVisualButton : Button, CustomVisualControlInterface {

        private Boolean _IsHovering = false;

        #region Properties

        [DesignerSerializationVisibility( DesignerSerializationVisibility.Hidden ), Browsable( false )]
        public override Font Font {
            get {
                return base.Font;
            }
            set {
                base.Font = value;
            }
        }

        #endregion

        #region Constructor

        public CustomVisualButton( ) {

            DoubleBuffered = true;
            Font = CustomVisualPalette.DefaultFont;
            SetStyle( ControlStyles.UserPaint, true );
            SetStyle( ControlStyles.SupportsTransparentBackColor, true );
        }

        #endregion

        #region Overrides

        protected override void OnMouseEnter( EventArgs Args ) {

            base.OnMouseEnter( Args );
            _IsHovering = true;
            Cursor = Cursors.Hand;
        }

        protected override void OnMouseLeave( EventArgs Args ) {

            base.OnMouseLeave( Args );
            _IsHovering = false;
            Cursor = Cursors.Default;
        }

        protected override void OnPaint( PaintEventArgs Args ) {
            // long paint method
        }

        protected override void OnResize( EventArgs Args ) {

            base.OnResize( Args );

            if ( CustomVisualPalette.FORCE_HEIGHT > 0 ) {

                Height = CustomVisualPalette.FORCE_HEIGHT;
            }
        }

        #endregion

    }

}

namespace CustomVisual {

    public interface CustomVisualControlInterface {
    }

}

using System.ComponentModel;
using System.ComponentModel.Design;
using System.Windows.Forms;
using System.Windows.Forms.Design;
using System.Drawing;
using System;

namespace CustomVisual {


    public class CustomVisualControlDesigner : ControlDesigner {

        private DesignerActionListCollection _ActionLists;

        public override DesignerActionListCollection ActionLists {
            get {
                if ( null == _ActionLists ) {
                    _ActionLists = new DesignerActionListCollection( );
                    _ActionLists.Add( new CustomVisualControlActionList( this.Component ) );
                }
                return _ActionLists;
            }
        }

    }

    public class CustomVisualControlActionList : DesignerActionList {

        private Control _Control;
        private DesignerActionUIService _Service = null;

        public CustomVisualControlInterface AlignSubject { get; set; }

        public CustomVisualControlActionList( IComponent Component )
            : base( Component ) {

            _Control = Component as Control;
            _Service = GetService( typeof( DesignerActionUIService ) ) as DesignerActionUIService;

        }

        public void RefreshDesigner( ) {

            _Service.HideUI( _Control );
            _Service.Refresh( _Control );
            _Service.ShowUI( _Control );
        }

        public Int32 SyncHeight( Control Source, Control Destination ) {
            // vertical alignment for elements of possible different height
        }

        public void MatchWidth( ) {
            // makes element width same as subject width
        }

        public void PlaceUnder( ) {
            // places element under subject
        }

        public void PlaceCloseUnder( ) {
            // places element close under subject
        }

        public void PlaceRight( ) {
            // places element right of subject
        }

        public void PlaceCloseRight( ) {
            // places element close right of subject
        }

        public void PlaceAbove( ) {
            // places element above subject
        }

        public void PlaceLeft( ) {
            // places element left of subject
        }

        public void AnchorType1( ) {
            // code to align to certain spot
        }

        public override DesignerActionItemCollection GetSortedActionItems( ) {

            DesignerActionItemCollection Items = new DesignerActionItemCollection( );
            Items.Add( new DesignerActionPropertyItem( "AlignSubject", "Subject", "alignment" ) );
            Items.Add( new DesignerActionMethodItem( this, "MatchWidth", "match width", "alignment" ) );
            Items.Add( new DesignerActionMethodItem( this, "PlaceAbove", "place above", "alignment" ) );
            Items.Add( new DesignerActionMethodItem( this, "PlaceRight", "place right", "alignment" ) );
            Items.Add( new DesignerActionMethodItem( this, "PlaceCloseRight", "place close right", "alignment" ) );
            Items.Add( new DesignerActionMethodItem( this, "PlaceUnder", "place under", "alignment" ) );
            Items.Add( new DesignerActionMethodItem( this, "PlaceCloseUnder", "place close under", "alignment" ) );
            Items.Add( new DesignerActionMethodItem( this, "PlaceLeft", "place left", "alignment" ) );
            Items.Add( new DesignerActionMethodItem( this, "AnchorType1", "anchor type 1", "anchors" ) );
            return Items;

        }

    }
}

---

确保在编辑设计器生成的代码时，以这样的方式进行编辑，以便它可以读取并重新序列化代码。在这种情况下，设计师正在寻找：

control.Click+=new System.EventHandler（this.methodname）

但我给它：

control.Click+=this.methodname

尽管它工作得很好，但当设计器被编辑和重新序列化时，它无法解析我所做的，只是将其删除

---

我发现我的错误是让设计师生成一个事件，这时我注意到它生成的代码和我给它的不同。如果您遇到类似的问题，我建议让设计器生成类似于您所做的事情，然后将其作为指导原则。

当控件在设计时引发异常时，可能会发生这种情况。我看不到有实力的候选人，这通常会引起很大的轰动，所以几乎没有领先优势。通过启动VS.Tools的第二个实例并附加到流程进行双重检查，然后选择第一个实例。调试+异常，勾选CLR异常的抛出复选框。切换到第一个问题，重新处理问题。@Hans Passant我刚刚解决了它，或者更确切地说，我刚刚意识到我做错了什么。在我正在工作的程序中，我开始使用这些新对象重新执行许多屏幕，对于我正在测试的第一个屏幕，我通过将新控件拖放到设计器中，然后手动将现有事件添加到设计器代码中来实现新控件。事实证明，设计师希望我使用

control+=new System.EventHandler（this.methodname）

，而不仅仅是

control+=this.methodname

。我甚至没有想到这可能是个问题。对，千万不要自己编辑InitializeComponent（）中的代码。设计器序列化程序只理解C#表达式的一小部分。@HansPassant是否有办法通过设计器将现有的事件方法作为事件添加到控件中？老实说，我个人对个人项目的偏好是完全不使用设计器进行编辑，而是将其用作预览窗口，但我的老板喜欢使用设计器。只需在“属性”窗口中键入现有事件处理程序的名称即可。首先单击闪电图标。编辑InitializeComponent（）实际上很好，它只需要一年的艰苦训练学校的学习。使用源代码管理。经常