Sharepoint Web部件自定义属性在服务器重新启动时获取默认值

我注意到，当我重新启动机器时，我开发的Web部件的自定义属性返回到它们的默认值

Web Part Error: An error occurred while setting the value of this property: TestWebpart:XMLFileUrl - Exception has been thrown by the target of an invocation.
Hide Error Details

[WebPartPageUserException: An error occurred while setting the value of this property: Blue_Graph.GraphWebpart.GraphWebpart:XMLFileUrl - Exception has been thrown by the target of an invocation.]
  at Microsoft.SharePoint.WebPartPages.BinaryWebPartDeserializer.ApplyPropertyState(Control control) 
  at Microsoft.SharePoint.WebPartPages.BinaryWebPartDeserializer.Deserialize() 
  at Microsoft.SharePoint.WebPartPages.SPWebPartManager.CreateWebPartsFromRowSetData(Boolean onlyInitializeClosedWebParts)

这是正常的行为吗？服务器运行时是否保存属性，或者是否缺少某些参数

Web Part Error: An error occurred while setting the value of this property: TestWebpart:XMLFileUrl - Exception has been thrown by the target of an invocation.
Hide Error Details

[WebPartPageUserException: An error occurred while setting the value of this property: Blue_Graph.GraphWebpart.GraphWebpart:XMLFileUrl - Exception has been thrown by the target of an invocation.]
  at Microsoft.SharePoint.WebPartPages.BinaryWebPartDeserializer.ApplyPropertyState(Control control) 
  at Microsoft.SharePoint.WebPartPages.BinaryWebPartDeserializer.Deserialize() 
  at Microsoft.SharePoint.WebPartPages.SPWebPartManager.CreateWebPartsFromRowSetData(Boolean onlyInitializeClosedWebParts)

多谢各位

Web Part Error: An error occurred while setting the value of this property: TestWebpart:XMLFileUrl - Exception has been thrown by the target of an invocation.
Hide Error Details

[WebPartPageUserException: An error occurred while setting the value of this property: Blue_Graph.GraphWebpart.GraphWebpart:XMLFileUrl - Exception has been thrown by the target of an invocation.]
  at Microsoft.SharePoint.WebPartPages.BinaryWebPartDeserializer.ApplyPropertyState(Control control) 
  at Microsoft.SharePoint.WebPartPages.BinaryWebPartDeserializer.Deserialize() 
  at Microsoft.SharePoint.WebPartPages.SPWebPartManager.CreateWebPartsFromRowSetData(Boolean onlyInitializeClosedWebParts)

编辑：代码：

namespace TestWebpart
{
    [ToolboxItemAttribute(false)]
    [XmlRoot(Namespace = "TestWebpart")]
    public class GraphWebpart : Microsoft.SharePoint.WebPartPages.WebPart
    {
        // Visual Studio might automatically update this path when you change the Visual Web Part project item.
        private const string _ascxPath = @"~/_CONTROLTEMPLATES/Test_Graph/TestWebpart/GraphWebpartUserControl.ascx";

        protected override void CreateChildControls()
        {
            ReloadElements();
        }

        protected void ReloadElements()
        {
            Controls.Clear();
            GraphWebpartUserControl control = (GraphWebpartUserControl)Page.LoadControl(_ascxPath);

            control.xmlDataUrl = XMLFileUrl;

            Controls.Add(control);
        }

        private static string _xmlFileUrl;
        [WebBrowsable(true),
        Personalizable(PersonalizationScope.Shared),
        DefaultValue(""),
        Description("xml"),
        DisplayName("xml"),
        WebDisplayName("xml")]
        public string XMLFileUrl
        {
            get { return _xmlFileUrl; }
            set { 
                _xmlFileUrl = value;
                ReloadElements();
            }
        }
}
}

Web Part Error: An error occurred while setting the value of this property: TestWebpart:XMLFileUrl - Exception has been thrown by the target of an invocation.
Hide Error Details

[WebPartPageUserException: An error occurred while setting the value of this property: Blue_Graph.GraphWebpart.GraphWebpart:XMLFileUrl - Exception has been thrown by the target of an invocation.]
  at Microsoft.SharePoint.WebPartPages.BinaryWebPartDeserializer.ApplyPropertyState(Control control) 
  at Microsoft.SharePoint.WebPartPages.BinaryWebPartDeserializer.Deserialize() 
  at Microsoft.SharePoint.WebPartPages.SPWebPartManager.CreateWebPartsFromRowSetData(Boolean onlyInitializeClosedWebParts)

EDIT2: 从字段中删除static会引发流动异常：

Web Part Error: An error occurred while setting the value of this property: TestWebpart:XMLFileUrl - Exception has been thrown by the target of an invocation.
Hide Error Details

[WebPartPageUserException: An error occurred while setting the value of this property: Blue_Graph.GraphWebpart.GraphWebpart:XMLFileUrl - Exception has been thrown by the target of an invocation.]
  at Microsoft.SharePoint.WebPartPages.BinaryWebPartDeserializer.ApplyPropertyState(Control control) 
  at Microsoft.SharePoint.WebPartPages.BinaryWebPartDeserializer.Deserialize() 
  at Microsoft.SharePoint.WebPartPages.SPWebPartManager.CreateWebPartsFromRowSetData(Boolean onlyInitializeClosedWebParts)

---

首先，你不应该这样做

Web Part Error: An error occurred while setting the value of this property: TestWebpart:XMLFileUrl - Exception has been thrown by the target of an invocation.
Hide Error Details

[WebPartPageUserException: An error occurred while setting the value of this property: Blue_Graph.GraphWebpart.GraphWebpart:XMLFileUrl - Exception has been thrown by the target of an invocation.]
  at Microsoft.SharePoint.WebPartPages.BinaryWebPartDeserializer.ApplyPropertyState(Control control) 
  at Microsoft.SharePoint.WebPartPages.BinaryWebPartDeserializer.Deserialize() 
  at Microsoft.SharePoint.WebPartPages.SPWebPartManager.CreateWebPartsFromRowSetData(Boolean onlyInitializeClosedWebParts)

private static string _xmlFileUrl;

应该是

Web Part Error: An error occurred while setting the value of this property: TestWebpart:XMLFileUrl - Exception has been thrown by the target of an invocation.
Hide Error Details

[WebPartPageUserException: An error occurred while setting the value of this property: Blue_Graph.GraphWebpart.GraphWebpart:XMLFileUrl - Exception has been thrown by the target of an invocation.]
  at Microsoft.SharePoint.WebPartPages.BinaryWebPartDeserializer.ApplyPropertyState(Control control) 
  at Microsoft.SharePoint.WebPartPages.BinaryWebPartDeserializer.Deserialize() 
  at Microsoft.SharePoint.WebPartPages.SPWebPartManager.CreateWebPartsFromRowSetData(Boolean onlyInitializeClosedWebParts)

private string _xmlFileUrl;

此静态变量将在IISRESET上丢失-在服务器场中不起作用，如果使用多线程环境（如web服务器），则可能导致所有类型的“线程安全”问题

Web Part Error: An error occurred while setting the value of this property: TestWebpart:XMLFileUrl - Exception has been thrown by the target of an invocation.
Hide Error Details

[WebPartPageUserException: An error occurred while setting the value of this property: Blue_Graph.GraphWebpart.GraphWebpart:XMLFileUrl - Exception has been thrown by the target of an invocation.]
  at Microsoft.SharePoint.WebPartPages.BinaryWebPartDeserializer.ApplyPropertyState(Control control) 
  at Microsoft.SharePoint.WebPartPages.BinaryWebPartDeserializer.Deserialize() 
  at Microsoft.SharePoint.WebPartPages.SPWebPartManager.CreateWebPartsFromRowSetData(Boolean onlyInitializeClosedWebParts)

当SharePoint加载web部件时（或在toolpart中单击“保存/应用”后），它会使用反射来查找您的属性（“可浏览…”属性），然后使用序列化将属性的值加载/保存到数据库中。这两个属性之一失败

Web Part Error: An error occurred while setting the value of this property: TestWebpart:XMLFileUrl - Exception has been thrown by the target of an invocation.
Hide Error Details

[WebPartPageUserException: An error occurred while setting the value of this property: Blue_Graph.GraphWebpart.GraphWebpart:XMLFileUrl - Exception has been thrown by the target of an invocation.]
  at Microsoft.SharePoint.WebPartPages.BinaryWebPartDeserializer.ApplyPropertyState(Control control) 
  at Microsoft.SharePoint.WebPartPages.BinaryWebPartDeserializer.Deserialize() 
  at Microsoft.SharePoint.WebPartPages.SPWebPartManager.CreateWebPartsFromRowSetData(Boolean onlyInitializeClosedWebParts)

我会怀疑这个属性有什么问题——并向后工作，直到它停止工作；）

Web Part Error: An error occurred while setting the value of this property: TestWebpart:XMLFileUrl - Exception has been thrown by the target of an invocation.
Hide Error Details

[WebPartPageUserException: An error occurred while setting the value of this property: Blue_Graph.GraphWebpart.GraphWebpart:XMLFileUrl - Exception has been thrown by the target of an invocation.]
  at Microsoft.SharePoint.WebPartPages.BinaryWebPartDeserializer.ApplyPropertyState(Control control) 
  at Microsoft.SharePoint.WebPartPages.BinaryWebPartDeserializer.Deserialize() 
  at Microsoft.SharePoint.WebPartPages.SPWebPartManager.CreateWebPartsFromRowSetData(Boolean onlyInitializeClosedWebParts)

---

这不是正常的行为，因为属性被持久保存在数据库中。一些示例代码总是有帮助的…好吧，我的代码没有什么特别之处，请参阅更新。我突然想到的一件事是您从中继承的类。请查看此处的备注-您了解static在做什么吗（它隐藏了一个事实，即属性中存在错误，并且属性的序列化不起作用）-您是否尝试过更改属性？