使用Asp.net在gridview中计算 [英] calculation in gridview using Asp.net

问题描述

我在网格视图中执行计算，但是他给出了错误

App_Web_pbkfehdc.dll中出现System.NullReferenceException类型的异常，但未在用户代码中处理

附加信息：对象引用未设置为对象的实例。

i am Perform Calculation in grid view but he give error
An exception of type ''System.NullReferenceException'' occurred in App_Web_pbkfehdc.dll but was not handled in user code
Additional information: Object reference not set to an instance of an object.

protected void Grd_RowDataBound(object seder, GridViewRowEventArgs e)
    {            
        foreach (GridViewRow Row in Grd.Rows)
        {
            TextBox TxtNum1 = (TextBox)e.Row.FindControl("Text2");
            TextBox TxtNum2 = (TextBox)e.Row.FindControl("Text1");
            TextBox TxtNum3 = (TextBox)e.Row.FindControl("Text3");
            float Num1, num2, num3;
            Num1 = Convert.ToSingle(TxtNum1.Text);
            num2 = Convert.ToSingle(TxtNum2.Text);
            num3 = Num1 + num2;
            TxtNum3.Text = Convert.ToString(num3);
        }
    }

更新：[代码块]

Updated: [Code block]

推荐答案

protected void Grd_RowDataBound(object seder, GridViewRowEventArgs e)
    {            
        foreach (GridViewRow Row in Grd.Rows)
        {
            TextBox TxtNum1 = (TextBox)e.Row.FindControl("Text2");
            TextBox TxtNum2 = (TextBox)e.Row.FindControl("Text1");
            TextBox TxtNum3 = (TextBox)e.Row.FindControl("Text3");
            float Num1, num2, num3;
            
            if(TxtNum1.Text!="")
            {
            Num1 = Convert.ToSingle(TxtNum1.Text);
            }
            if(TxtNum2.Text!="")
            {
            num2 = Convert.ToSingle(TxtNum2.Text);
            }
            num3 = Num1 + num2;
            if(num3!=null)
            {
            TxtNum3.Text = Convert.ToString(num3);
            }
        }
    }

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