来自Label的Windows窗体设计器自定义控件的属性值错误 - >设计器异常 [英] Windows Forms Designer Custom Control from Label has wrong property value -> designer exception

问题描述

我其实有点困惑这里，我已经建立了一个dll与基于Label的自定义控件AutoSize固定为true。我很高兴地使用它，但设计器创建控件与AutoSize仍然设置为真。

我改变了dll，试图让设计器显示我的控制与AutoSize设置false，并在设计器中抛出一个异常。

我忽略了最后一次更改，但仍有异常！

我无法进步，直到我从头开始创建一个新项目，删除所有引用的dll。

我真的不知道那里发生了什么。 / p>

这是我想到的是发生的：

dll是在自己的项目

它包含基于 System :: Windows的自定义控件:: Forms :: Label 与 AutoSize 总是false。 （我知道这很简单，但是当我知道我在做什么时，我打算扩展它。）

表单上添加的标签没有 AutoSize 设置为false这是我想要的。

当我添加属性 [DesignerSerializationVisibility（DesignerSerializationVisibility :: Content）]

当设置器视图反映运行时行为时， code>
我在设计器中抛出异常

[我不知道这是否真的是因为撤消它的问题整理我]

输出

 在VSLangProj.Reference.get_Path （）
 at Microsoft.VisualStudio.Design.VSTypeResolutionService.AssemblyEntry.get_FileName（）
 at Microsoft.VisualStudio.Design.VSTypeResolutionService.AssemblyEntry.GetMatchIndex（String typeName）
 at Microsoft.VisualStudio.Design .VSTypeResolutionService.SearchNormalEntries（AssemblyName assemblyName，String typeName，Boolean ignoreTypeCase，Assembly& assembly，Boolean fastSearch）
 at Microsoft.VisualStudio.Design.VSTypeResolutionService.SearchEntries（AssemblyName assemblyName，String typeName，Boolean ignoreCase，Assembly& assembly，ReferenceType refType）
在$ Microsoft.VisualStudio.Design.Serialization.CodeDom.AggregateTypeResolutionService.GetType（String name）时，
在Microsoft.VisualStudio.Design.VSTypeResolutionService.GetType（String typeName，Boolean throwOnError，Boolean ignoreCase，ReferenceType refType） ，Boolean throwOnError，Boolean ignoreCase）
在Microsoft.VisualStudio.Design.Serialization.CodeDom.AggregateTypeResolutionService.GetType（String name）
在System.ComponentModel.Design.DesignerHost.System.ComponentModel.Design.IDesignerHost。在System.ComponentModel.Design.Serialization.CodeDomDesignerLoader.PerformLoad（IDesignerSerializationManager经理）
在System.ComponentModel.Design.Serialization.CodeDomDesignerLoader.EnsureDocument（IDesignerSerializationManager经理）
 $ Microsoft.VisualStudio.Design.Serialization.CodeDom.VSCodeDomDesignerLoader.PerformLoad（IDesignerSerializationManager serializationManager）
在System.ComponentModel.Design.Serialization.BasicDesignerLoader.BeginLoad（IDesignerLoader主机）
  

代码

  #pragma once 
 
 #using< System.DLL> 
 #using< System.Drawing.DLL> 
 #using< System.Windows.Forms.DLL> 
 
命名空间EasyButtons {
 
使用命名空间System; 
 using namespace System :: ComponentModel; 
 using namespace System :: Collections; 
 using namespace System :: Windows :: Forms; 
 using namespace System :: Data; 
 using namespace System :: Drawing; 
 
 
 public ref class ResizeLabel：public System :: Windows :: Forms :: Label 
 {
 public：ResizeLabel（void）{
 this- > AutoSize = false; 
} 
 public：
 virtual property bool AutoSize 
 {
 [DesignerSerializationVisibility（DesignerSerializationVisibility :: Content）] 
 bool get（）override 
 {
 return false; 
} 
 
 void set（bool x）override 
 {
 this-> AutoSize = false; 
} 
} 
 
 // ... 
 
} 
  

解决方案

  void set（bool x）override 
 {
 this-> AutoSize = false; 
} 
  

这是一个错误，你再次调用setter。这将使设计器崩溃的堆栈溢出，只要你把控件放在窗体上。修正：

  void set（bool x）override 
 {
 __super :: AutoSize = false; 
} 
  

您还必须在属性上应用属性， p>

I'm actually a bit confused here, I've built a dll with a custom control based on Label with AutoSize fixed as true. I happily used it but the designer created the control with AutoSize still set to true.

I changed the dll in an attempt to get the designer to show my control with AutoSize set false and ended up with a thrown exception in the designer.

I undid the last change but still got the exception!

I couldn't progress until I created a new project from scratch removing all reference to the dll.

I really don't know what went on there.

Here's what I thought was happening:

The dll is created in it's own project (& solution too) which I've added to the toolbox and used in the designer in a different project.

It contains a custom control based on System::Windows::Forms::Label with AutoSize always false. (I know this is very simple, but I intend to extend it when I know what I'm doing!)

The label added on the form does not have AutoSize set to false which is what I want. I just want the designer view to reflect the run time behaviour.

When I added the attribute [DesignerSerializationVisibility(DesignerSerializationVisibility::Content)] I get an exception thrown in the designer

[I'm not sure if this is really the problem as undoing it didn't sort me out]

Output

at VSLangProj.Reference.get_Path()
at Microsoft.VisualStudio.Design.VSTypeResolutionService.AssemblyEntry.get_FileName()
at Microsoft.VisualStudio.Design.VSTypeResolutionService.AssemblyEntry.GetMatchIndex(String typeName)
at Microsoft.VisualStudio.Design.VSTypeResolutionService.SearchNormalEntries(AssemblyName assemblyName, String typeName, Boolean ignoreTypeCase, Assembly& assembly, Boolean fastSearch)
at Microsoft.VisualStudio.Design.VSTypeResolutionService.SearchEntries(AssemblyName assemblyName, String typeName, Boolean ignoreCase, Assembly& assembly, ReferenceType refType)
at Microsoft.VisualStudio.Design.VSTypeResolutionService.GetType(String typeName, Boolean throwOnError, Boolean ignoreCase, ReferenceType refType)
at Microsoft.VisualStudio.Design.Serialization.CodeDom.AggregateTypeResolutionService.GetType(String name, Boolean throwOnError, Boolean ignoreCase)
at Microsoft.VisualStudio.Design.Serialization.CodeDom.AggregateTypeResolutionService.GetType(String name)
at System.ComponentModel.Design.DesignerHost.System.ComponentModel.Design.IDesignerHost.GetType(String typeName)
at System.ComponentModel.Design.Serialization.CodeDomDesignerLoader.EnsureDocument(IDesignerSerializationManager manager)
at System.ComponentModel.Design.Serialization.CodeDomDesignerLoader.PerformLoad(IDesignerSerializationManager manager)
at Microsoft.VisualStudio.Design.Serialization.CodeDom.VSCodeDomDesignerLoader.PerformLoad(IDesignerSerializationManager serializationManager)
at System.ComponentModel.Design.Serialization.BasicDesignerLoader.BeginLoad(IDesignerLoaderHost host) 

Code

#pragma once

#using <System.DLL>
#using <System.Drawing.DLL>
#using <System.Windows.Forms.DLL>

namespace EasyButtons {

using namespace System;
using namespace System::ComponentModel;
using namespace System::Collections;
using namespace System::Windows::Forms;
using namespace System::Data;
using namespace System::Drawing;


public ref class ResizeLabel : public System::Windows::Forms::Label
{
public: ResizeLabel(void) {
        this->AutoSize = false;
    }
public:
    virtual property bool AutoSize
    {
        [DesignerSerializationVisibility(DesignerSerializationVisibility::Content)]
        bool get() override
        {
            return false;
        }

        void set(bool x) override
        {
            this->AutoSize = false;
        }
    }

// ... 

}

解决方案

    void set(bool x) override
    {
        this->AutoSize = false;
    }

That's a bug, you call the setter again. This will crash the designer with a stack overflow as soon as you put the control on a form. Fix:

    void set(bool x) override
    {
        __super::AutoSize = false;
    }

You must also apply the attribute on the property, not the getter.

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