Question

我有一个简单的Repeater绑定到一个对象列表，该对象包含一系列用于渲染的字符串。

对象如下：

class BestPractice
    {
        public string Title { get; set; }
        public string Author { get; set; }
        public string Body { get; set; }
    }

使用以下代码进行渲染，以确保循环不会导致问题：

List<BestPractice> BestPractices = new List<BestPractice>();
foreach (SPListItem item in items)
                {
                    BestPractice bp = new BestPractice();
                    bp.Author = "test";//(string)item["Author"];
                    bp.Body = "test";// (string)item["Body"];
                    bp.Title = "test";// (string)item["Title"];
                    BestPractices.Add(bp);
                }

                BPRepeater.DataSource = BestPractices;
                BPRepeater.DataBind();

我已逐步完成代码以确保List包含一个项目，并且该项目在数据绑定之前已填充字符串。异常发生在.g.cs文件中：

[global::System.ComponentModel.EditorBrowsableAttribute(global::System.ComponentModel.EditorBrowsableState.Never)]
        public void @__DataBind__control4(object sender, System.EventArgs e) {
            System.Web.UI.WebControls.RepeaterItem Container;
            System.Web.UI.DataBoundLiteralControl target;
            target = ((System.Web.UI.DataBoundLiteralControl)(sender));
            Container = ((System.Web.UI.WebControls.RepeaterItem)(target.BindingContainer));
            target.SetDataBoundString(0, System.Convert.ToString(DataBinder.Eval(Container.DataItem, "Author"), System.Globalization.CultureInfo.CurrentCulture));
        }

以下是例外情况：

System.Reflection.TargetInvocationException was unhandled by user code
  Message=Property accessor 'Author' on object 'Carpool_Webparts.Offer_Details.BestPractice' threw the following exception:'Carpool_Webparts.Offer_Details.BestPractice.get_Author()'
  Source=System
  StackTrace:
       at System.ComponentModel.ReflectPropertyDescriptor.GetValue(Object component)
       at System.Web.UI.DataBinder.GetPropertyValue(Object container, String propName)
       at System.Web.UI.DataBinder.Eval(Object container, String[] expressionParts)
       at Carpool_Webparts.Offer_Details.Offer_Details.__DataBind__control4(Object sender, EventArgs e)
       at System.Web.UI.Control.OnDataBinding(EventArgs e)
       at System.Web.UI.Control.DataBind(Boolean raiseOnDataBinding)
       at System.Web.UI.Control.DataBindChildren()
  InnerException: System.MethodAccessException
       Message=Carpool_Webparts.Offer_Details.BestPractice.get_Author()
       Source=mscorlib
       StackTrace:
            at System.Reflection.MethodBase.PerformSecurityCheck(Object obj, RuntimeMethodHandle method, IntPtr parent, UInt32 invocationFlags)
            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 System.ComponentModel.ReflectPropertyDescriptor.GetValue(Object component)
       InnerException: System.Security.SecurityException
            Message=Request for the permission of type 'System.Security.Permissions.ReflectionPermission, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' failed.
            Source=mscorlib
            StackTrace:
                 at System.Security.CodeAccessSecurityEngine.ThrowSecurityException(Assembly asm, PermissionSet granted, PermissionSet refused, RuntimeMethodHandle rmh, SecurityAction action, Object demand, IPermission permThatFailed)
                 at System.Security.CodeAccessSecurityEngine.CheckSetHelper(PermissionSet grants, PermissionSet refused, PermissionSet demands, RuntimeMethodHandle rmh, Object assemblyOrString, SecurityAction action, Boolean throwException)
                 at System.Security.PermissionSetTriple.CheckSetDemand(PermissionSet demandSet, PermissionSet& alteredDemandset, RuntimeMethodHandle rmh)
                 at System.Security.PermissionListSet.CheckSetDemand(PermissionSet pset, RuntimeMethodHandle rmh)
                 at System.Security.PermissionListSet.DemandFlagsOrGrantSet(Int32 flags, PermissionSet grantSet)
                 at System.Security.CodeAccessSecurityEngine.ReflectionTargetDemandHelper(Int32 permission, PermissionSet targetGrant, CompressedStack securityContext)
                 at System.Security.CodeAccessSecurityEngine.ReflectionTargetDemandHelper(Int32 permission, PermissionSet targetGrant)
            InnerException:

我完全迷失了:(

Answer 1

我不是100％确定具体问题是什么，但根据错误消息，我建议两个可能的变化：

1）确认BestPractice类是公开的（一旦验证它是否正常工作，您可以将曝光级别调低）。

2）将自动实现的属性更改为成员支持的属性。内部异常表明get_Author访问器存在安全性异常，这使我相信自动实现可能与它有关。

Answer 2

确保SharePoint可以看到最新版的程序集。实现这一目标的最可靠方法是确保dll不在web app bin文件夹中（如果它在那里将其从那里删除）并将最新的内置版本复制到GAC。如果错误消失 - 分别调整部署过程。

转发器上的TargetInvocationException

2 个答案: