搜索记录时出错 | 搜索记录时出错

本文介绍了搜索记录时出错的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

任何人都可以拨打这是什么类型的错误.?

这里出现错误

hi can any one telmme what type of error is this.?

here am getting error

 protected void grdFaculty_RowDataBound(object sender, GridViewRowEventArgs e)
    {
        if (e.Row.RowType == DataControlRowType.DataRow)
        {
//for sum m getting error
            sum = sum + Convert.ToInt32(DataBinder.Eval(e.Row.DataItem, "NoOfDuties"));//in this line m getting error
        }
        if (e.Row.RowType == DataControlRowType.Footer)
        {
            Label obj = (Label)e.Row.FindControl("Sum");
            obj.Text = Convert.ToString(sum);
        }
    }

like
Object cannot be cast from DBNull to other types.
can any one suggest me?

推荐答案

DataBinder.Eval(e.Row.DataItem, "NoOfDuties")

相反:

Instead:

if (! DBNull.Value.Equals(DataBinder.Eval(e.Row.DataItem, "NoOfDuties"))
    sum = sum + Convert.ToInt32(DataBinder.Eval(e.Row.DataItem, "NoOfDuties"));

在此处 [ ^ ]

在这里，我假设DBNull表示该字段为0.

More information is available here[^]

Here, I have assumed that DBNull means 0 for this field.

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