搜索记录时出错 [英] error for searching a record

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

我假设您的语法正确.下面的行返回您要转换为Int32的DBNull.

I am assuming your syntax is correct. The line below returns DBNull which you are trying to cast to Int32.

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 [

More information is available here[^]

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

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