报表处理期间发生错误.调用的目标抛出了异常.对象引用未设置为对象的实例 [英] An error has occured during report processing.Exception has been thrown by the target of an invocation.Object reference not set to an instance of an object

问题描述

<pre lang="cs">public void ShowQueryBranchTATCrossed()
      {
          bool vFlag = false;

          try
          {
              rptViewer.Visible = true;
              //rptViewer.LocalReport.ReportPath="C:/Priya Working Folder/WorkingEnvironment/ILeverage2k10/ILeverage2k10/ILev_QueryBranchTATCrossedReport.rdlc";
              rptViewer.LocalReport.Refresh();

              vFlag = true;

          }
          catch (Exception Exp)
          {
              LogEvent(Exp);
              vFlag = false;
          }


          if (!vFlag)
          {
              ScriptManager.RegisterClientScriptBlock(this, typeof(string), "message", "alert(''Unable to retrive the data, please contact system admin.'');location.href=''ILeverage_Blank.aspx''", true);
          }
      }

推荐答案

在哪里?哪条线?
尝试并调试此代码.
当尚未实例化某些对象且该对象为null且我们试图访问其中的属性或方法时，会发生此错误.找出哪个对象为空，然后对其进行初始化.

可能是rptViewer.LocalReport.Refresh(); where you are trying to access Refresh()，但LocalRepost可能是null.

Where? Which line?
Try and debug this code.
This error occurs when some object has not been instantiated and is null and we are trying to access an attribute or method inside it. Figure out which object is null and then initialize it.

It could be rptViewer.LocalReport.Refresh(); where you are trying to access Refresh() but LocalRepost may be null.

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