C# 修改MOSS web部件时出错

每当我尝试在sharepoint 2007中编辑自定义web部件的共享属性时，都会出现以下错误：

Exception has been thrown by the target of an invocation.
  at System.RuntimeMethodHandle._InvokeMethodFast(Object target, Object[] arguments, SignatureStruct& sig, MethodAttributes methodAttributes, RuntimeTypeHandle typeOwner)
  at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture, Boolean skipVisibilityChecks)
  at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
  at Microsoft.SharePoint.WebPartPages.ExtendedPropertyInfo.GetValue(Object target, Object[] indexValues)
  at Microsoft.SharePoint.WebPartPages.PropertySheetProperty.get_Value()
  at Microsoft.SharePoint.WebPartPages.PropertySheetProperty.get_IsNull()
  at Microsoft.SharePoint.WebPartPages.PropertySheetProperty..ctor(WebPart targetWebPart, SPWebPartManager webPartManager, PropertyInfo pi)
  at Microsoft.SharePoint.WebPartPages.PropertySheetProperties.GetProperties(WebPart targetWebPart, SPWebPartManager manager, Boolean inPersonalizationMode, IPropertySheetPropertiesFilter filter)
  at Microsoft.SharePoint.WebPartPages.CustomPropertyToolPart.CreatePropertyGrid()
  at Microsoft.SharePoint.WebPartPages.CustomPropertyToolPart.CreateChildControls()
  at System.Web.UI.Control.EnsureChildControls()
  at System.Web.UI.Control.PreRenderRecursiveInternal()
  at System.Web.UI.Control.PreRenderRecursiveInternal()
  at System.Web.UI.Control.PreRenderRecursiveInternal()
  at System.Web.UI.Control.PreRenderRecursiveInternal()
  at System.Web.UI.Control.PreRenderRecursiveInternal()
  at System.Web.UI.Control.PreRenderRecursiveInternal()
  at System.Web.UI.Control.PreRenderRecursiveInternal()
  at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)

我的web部件中有一些自定义属性，用于设置表单生成的通知电子邮件的电子邮件地址。这方面的一个例子是：

    [WebBrowsable(true),
    Personalizable(true),
    DefaultValue("myemail@company.com"),
    Category("Email Properties"),
    Microsoft.SharePoint.WebPartPages.WebPartStorage(Microsoft.SharePoint.WebPartPages.Storage.Shared),
    Microsoft.SharePoint.WebPartPages.FriendlyName("Email Addresses (separate multiple emails with a comma):"),
    Description("Please enter the email addresses for those that should be notified when an incident takes place at a Corporate location.")]
    public string CorpMessageEmailAddresses { get; set; }

然而，即使这些属性被注释掉，我在尝试修改web部件时仍然会出错

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还有谁处理过这样的问题吗？如果需要的话，我可以提供更多信息或代码片段。

好的，我昨晚晚些时候发现了这一点……这是一个隐藏在异常中的典型MS异常。显示的异常不是原因，而是发生的最后一个异常。真正的例外是与我的ViewState变量有关的问题。我尝试了一下，现在一切都很好

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直到今天早上我才看到你的评论，感谢你的帮助

好吧，我昨晚很晚才发现……这是一个典型的MS异常，隐藏在异常中。显示的异常不是原因，而是发生的最后一个异常。真正的例外是与我的ViewState变量有关的问题。我尝试了一下，现在一切都很好

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直到今天早上我才看到你的评论，感谢你的帮助

披露：我是OP的同事。您的web部件是来自Microsoft.SharePoint.WebPartPages.WebPartPages还是来自System.web.UI.WebControl.WebParts.WebPart？另外，您可以发布.WebPart XML文件吗？（当然，除非您使用的是.dwp，否则请发布该文件）。披露：我是OP的同事。您的web部件是来自Microsoft.SharePoint.WebPartPages.WebPart还是来自

System.web.UI.WebControl.WebParts.WebPart

？此外，您可以发布.WebPart XML文件吗？（当然，除非您使用的是.dwp，否则请发布该文件）。