设计器中的C＃扩展控件

Question

I extended a control like so

public partial class NewControl : OriginalControl
{

    public NewControl()
    {

    }

}

and changed these lines in the MyForm.Designer.cs from

private OriginalControl control1;
this.control1 = new OriginalControl();

to

private NewControl control1;
this.control1 = new NewControl();

How ever when I open my form in designer I get this error:

Failed to load designer. Check the source code for syntax errors and check if all references are available.

ICSharpCode.FormsDesigner.FormsDesignerLoadException: System.ComponentModel.Design.Serialization.CodeDomSerializerException: Could not find type 'NewControl'. Please make sure that the assembly that contains this type is referenced. If this type is a part of your development project, make sure that the project has been successfully built using settings for your current platform or Any CPU. at System.ComponentModel.Design.Serialization.CodeDomSerializerBase.Error(IDesignerSerializationManager manager, String exceptionText, String helpLink) at System.ComponentModel.Design.Serialization.CodeDomSerializerBase.DeserializeExpression(IDesignerSerializationManager manager, String name, CodeExpression expression) at System.ComponentModel.Design.Serialization.CodeDomSerializer.DeserializeStatementToInstance(IDesignerSerializationManager manager, CodeStatement statement) at System.ComponentModel.Design.Serialization.CodeDomSerializer.Deserialize(IDesignerSerializationManager manager, Object codeObject) at ICSharpCode.FormsDesigner.Services.ProjectResourcesComponentCodeDomSerializer.Deserialize(IDesignerSerializationManager manager, Object codeObject) at System.Windows.Forms.Design.ControlCodeDomSerializer.Deserialize(IDesignerSerializationManager manager, Object codeObject) at ICSharpCode.FormsDesigner.Services.ProjectResourcesComponentCodeDomSerializer.Deserialize(IDesignerSeriali zationManager manager, Object codeObject) at System.ComponentModel.Design.Serialization.TypeCodeDomSerializer.DeserializeName(IDesignerSerializationManager manager, String name, CodeStatementCollection statements)

System.ComponentModel.Design.Serialization.CodeDomSerializerException: The variable 'control1' is either undeclared or was never assigned. at System.ComponentModel.Design.Serialization.CodeDomSerializerBase.Error(IDesignerSerializationManager manager, String exceptionText, String helpLink) at System.ComponentModel.Design.Serialization.CodeDomSerializerBase.DeserializeExpression(IDesignerSerializationManager manager, String name, CodeExpression expression) at System.ComponentModel.Design.Serialization.CodeDomSerializerBase.DeserializeExpression(IDesignerSerializationManager manager, String name, CodeExpression expression) at System.ComponentModel.Design.Serialization.CodeDomSerializerBase.DeserializeStatement(IDesignerSerializationManager manager, CodeStatement statement)

at ICSharpCode.FormsDesigner.FormsDesignerViewContent.LoadDesigner()
at ICSharpCode.FormsDesigner.FormsDesignerViewContent.LoadAndDisplayDesigner() at ICSharpCode.FormsDesigner.FormsDesignerViewContent.LoadInternal(OpenedFile file, Stream stream) at ICSharpCode.SharpDevelop.Gui.AbstractViewContentHandlingLoadErrors.Load(OpenedFile file, Stream stream)

How am I extending my control wrong?

Answer 1

This may purely be an issue with the namespaces in which these two controls appear. See if a fully qualified class name happens to solve you issue.