Re: TypeConverter HELP Needed!
From: ME (trash.trash_at_comcastDOTnet)
Date: 07/09/04
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Date: Fri, 09 Jul 2004 06:41:31 GMT
Also, I think the problem is with my converter but I am not understanding
how the ConvertTo override works.
Thanks,
Matt
"ME" <trash.trash@comcastDOTnet> wrote in message
news:_3rHc.52382$Oq2.24639@attbi_s52...
> Ok, I have a property called ControlType. The property is of type 'Type'.
> It stores just the type of control a user selected. I am really confused
> how I would implement a converter on this type of property since all I
need
> returned is the Type of control being referenced and not the control
itself.
> Trouble is when I use the following code in my custom control it takes a
> dive when the webform tries to display its html. So I humbly ask for some
> advice on how to solve this issue!
>
> Thanks,
>
> Matt
>
> //------------------------------------------- THE ERROR RETURN IS:
>
> Unable to generate code for a value of type 'System.Type'. This error
> occurred while trying to generate the property value for ControlType.
> Description: An unhandled exception occurred during the execution of the
> current web request. Please review the stack trace for more information
> about the error and where it originated in the code.
>
> Exception Details: System.Web.HttpException: Unable to generate code for a
> value of type 'System.Type'. This error occurred while trying to generate
> the property value for ControlType.
>
> Source Error:
>
> An unhandled exception was generated during the execution of the current
web
> request. Information regarding the origin and location of the exception
can
> be identified using the exception stack trace below.
>
> [HttpException (0x80004005): Unable to generate code for a value of type
> 'System.Type'. This error occurred while trying to generate the property
> value for ControlType.]
>
>
System.Web.Compilation.CodeDomUtility.GenerateExpressionForValue(PropertyInf
> o propertyInfo, Object value, Type valueType) +2255
>
>
System.Web.Compilation.TemplateControlCompiler.BuildBuildMethod(ControlBuild
> er builder, Boolean fTemplate, PropertySetterEntry pse) +2539
>
>
System.Web.Compilation.TemplateControlCompiler.BuildSourceDataTreeFromBuilde
> r(ControlBuilder builder, Boolean fInTemplate, PropertySetterEntry pse)
+794
>
>
System.Web.Compilation.TemplateControlCompiler.BuildSourceDataTreeFromBuilde
> r(ControlBuilder builder, Boolean fInTemplate, PropertySetterEntry pse)
+675
>
>
System.Web.Compilation.TemplateControlCompiler.BuildSourceDataTreeFromBuilde
> r(ControlBuilder builder, Boolean fInTemplate, PropertySetterEntry pse)
+675
>
>
System.Web.Compilation.TemplateControlCompiler.BuildSourceDataTreeFromBuilde
> r(ControlBuilder builder, Boolean fInTemplate, PropertySetterEntry pse)
+352
>
>
System.Web.Compilation.TemplateControlCompiler.BuildSourceDataTreeFromBuilde
> r(ControlBuilder builder, Boolean fInTemplate, PropertySetterEntry pse)
+352
> System.Web.Compilation.TemplateControlCompiler.BuildMiscClassMembers()
> +51
> System.Web.Compilation.PageCompiler.BuildMiscClassMembers() +10
> System.Web.Compilation.BaseCompiler.BuildSourceDataTree() +1276
> System.Web.Compilation.BaseCompiler.GetCompiledType() +129
> System.Web.UI.PageParser.CompileIntoType() +62
> System.Web.UI.TemplateParser.GetParserCacheItemThroughCompilation()
+126
>
> [HttpException (0x80004005): Unable to generate code for a value of type
> 'System.Type'. This error occurred while trying to generate the property
> value for ControlType.]
> System.Web.UI.TemplateParser.GetParserCacheItemInternal(Boolean
> fCreateIfNotFound) +692
> System.Web.UI.TemplateParser.GetParserCacheItem() +32
> System.Web.UI.TemplateControlParser.CompileAndGetParserCacheItem(String
> virtualPath, String inputFile, HttpContext context) +116
> System.Web.UI.TemplateControlParser.GetCompiledInstance(String
> virtualPath, String inputFile, HttpContext context) +36
> System.Web.UI.PageParser.GetCompiledPageInstanceInternal(String
> virtualPath, String inputFile, HttpContext context) +43
> System.Web.UI.PageHandlerFactory.GetHandler(HttpContext context, String
> requestType, String url, String path) +44
> System.Web.HttpApplication.MapHttpHandler(HttpContext context, String
> requestType, String path, String pathTranslated, Boolean useAppConfig)
+699
>
>
System.Web.MapHandlerExecutionStep.System.Web.HttpApplication+IExecutionStep
> .Execute() +95
> System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean&
> completedSynchronously) +173
>
>
>
>
> //------------------------------------------- HERE IS THE PROPERTY CODE:
>
> /// <summary>
> /// ControlType = The Type of control you referencing
> /// </summary>
> [
> NotifyParentProperty(true),
> TypeConverter(typeof(ControlGroupControlTypeConverter))
> ]
> public Type ControlType
> {
> get
> {
> return controltype;
> }
> set
> {
> controltype=(System.Type) value;
> }
> }
>
>
> //------------------------------------------- HERE IS THE CONVERTER CODE:
>
> using System;
> using System.Web.UI;
> using System.Web.UI.WebControls;
> using System.Web.UI.Design;
> using System.ComponentModel;
> using System.ComponentModel.Design;
> using System.Collections;
> using System.IO;
> using System.Text;
> using System.Drawing.Design;
> using System.Reflection;
> using System.ComponentModel.Design.Serialization;
> namespace ControlGroup
> {
> public class ControlGroupControlTypeConverter :
> System.ComponentModel.TypeConverter
> {
> public override bool CanConvertFrom(ITypeDescriptorContext context, Type
> sourceType)
> {
> if (sourceType == typeof(string))
> {
> return true;
> }
> return base.CanConvertFrom (context, sourceType);
> }
>
> public override object ConvertFrom(ITypeDescriptorContext context,
> System.Globalization.CultureInfo culture, object value)
> {
> if (value is string)
> {
> string v=(string) value;
> if (v == typeof(System.Web.UI.WebControls.TextBox).ToString())
> {
> return typeof(System.Web.UI.WebControls.TextBox);
> }
> }
> return base.ConvertFrom (context, culture, value);
> }
>
> public override bool CanConvertTo(ITypeDescriptorContext context, Type
> destinationType)
> {
> if (destinationType == typeof(InstanceDescriptor))
> {
> return true;
> }
> return base.CanConvertTo (context, destinationType);
> }
> public override object ConvertTo(ITypeDescriptorContext context,
> System.Globalization.CultureInfo culture, object value, Type
> destinationType)
> {
> if (destinationType == typeof(InstanceDescriptor) && value is Type)
> {
> Type t =(Type) value;
> ConstructorInfo ci = typeof(Type).GetConstructor(new Type[0]);
> // if (ci != null)
> // {
> return new InstanceDescriptor(ci,new object[0]);
> // }
> }
> return base.ConvertTo (context, culture, value, destinationType);
> }
> }
> }
>
>
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