Telerik Reporting：如何处理在报告上生成红色错误框的空日期？

发布于 2024-12-04 13:28:04 字数 731 浏览 1 评论 0原文

日期字段为报告上的文本框之一提供值；文本框属性页如下所示：

         Value       =Fields.eventdate.ToString("D")

当 eventdate 为 null 时，报告会显示红色错误框。在这种情况下处理空值的正确方法是什么？

我尝试使用三元运算符代替上述操作，但这会导致错误：

         Value       =(Fields.evendate != null) ? : Fields.eventdate.ToString("D") : String.Empty

Is it possible to trap this null in the ItemDataBinding eventhandler linked to the textbox?似乎无法从那里访问 Fields 集合：

   private void textBox28_ItemDataBinding(object sender, EventArgs e)
    {
          Telerik.Reporting.Processing.TextBox tb = (Telerik.Reporting.Processing.TextBox) sender;
          .
          .
          .
    }

原文

A date field supplies the value for one of the textboxes on the report; here's how the textbox property page looks:

         Value       =Fields.eventdate.ToString("D")

When eventdate is null, the report displays an error box in red. What's the proper way to handle null values in this scenario?

I tried using the ternary operator in place of the above, but that causes an error:

         Value       =(Fields.evendate != null) ? : Fields.eventdate.ToString("D") : String.Empty

Is it possible to trap this null in the ItemDataBinding eventhandler associated with the textbox? It doesn't seem as though the Fields collection is accessible from there:

   private void textBox28_ItemDataBinding(object sender, EventArgs e)
    {
          Telerik.Reporting.Processing.TextBox tb = (Telerik.Reporting.Processing.TextBox) sender;
          .
          .
          .
    }

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沉溺在你眼里的海 2024-12-11 13:28:04

知道了：

private void textBox28_ItemDataBinding(object sender, EventArgs e)
{
  Telerik.Reporting.Processing.ReportItemBase item ;
  item = (Telerik.Reporting.Processing.ReportItemBase)sender;
  System.Data.DataRowView drv = (item.DataObject.RawData as System.Data.DataRowView);

  //now test the drv.Row[ colname ] for DBNull.Value

}

Got it:

private void textBox28_ItemDataBinding(object sender, EventArgs e)
{
  Telerik.Reporting.Processing.ReportItemBase item ;
  item = (Telerik.Reporting.Processing.ReportItemBase)sender;
  System.Data.DataRowView drv = (item.DataObject.RawData as System.Data.DataRowView);

  //now test the drv.Row[ colname ] for DBNull.Value

}

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