[WCF]DomainServices客户端操作异常处理

作为个人备忘，不做排版。此扩展函数用于DomainServices的Load及SubmitChanges时处理Error信息，包括验证消息、实体冲突。

 public static string ToErrorString(this System.ServiceModel.DomainServices.Client.OperationBase op)
 {
     //来自http://www.cnblogs.com/ainijiutian/p/3616198.html
     if (op.HasError)
     {
         op.MarkErrorAsHandled();

         System.Text.StringBuilder sb = new System.Text.StringBuilder();
         if (op is System.ServiceModel.DomainServices.Client.LoadOperation)
         {
             var lo = op as System.ServiceModel.DomainServices.Client.LoadOperation;
             if (lo.ValidationErrors != null && lo.ValidationErrors.Any())
             {
                 sb.Append("Validation Errors:\r\n" + string.Join("\r\n", lo.ValidationErrors.Select(t => t.ErrorMessage)) + "\r\n\r\n");
             }
             sb.Append("Error message:\r\n" + lo.Error.ToString());

             return sb.ToString();
         }
         else if (op is System.ServiceModel.DomainServices.Client.SubmitOperation)
         {
             var so = op as System.ServiceModel.DomainServices.Client.SubmitOperation;
             if (so.EntitiesInError != null && so.EntitiesInError.Any())
             {
                 foreach (var e in so.EntitiesInError)
                 {
                     sb.Append(so.EntitiesInError.First().GetType() + " " + e.ToString() + ":\r\n");
                     if (e.HasValidationErrors)
                     {
                         sb.Append("Validation Errors:\r\n" + string.Join("\r\n", e.ValidationErrors.Select(t => t.ErrorMessage)) + "\r\n");
                     }
                     if (!e.EntityConflict.IsDeleted && e.EntityConflict != null && e.EntityConflict.PropertyNames != null && e.EntityConflict.PropertyNames.Any())
                     {
                         sb.Append("Entity conflict:\r\n" + string.Join(", ", e.EntityConflict.PropertyNames) + "\r\n");
                     }
                 }
                 sb.Append("\r\n");
             }
             sb.Append("Error message:\r\n" + so.Error.ToString());
             //if (sb.ToString().Contains("STAMP")) //timestamp
             //{
             //    return "Document has been changed in other place,please undo the current changes and reopen .";
             //}
             //else
             //{
             //    return sb.ToString();
             //}
             return sb.ToString();
         }
     }
     return op.ToString();
 }