下拉值未正确验证 [英] dropdown values not validating properly

问题描述

我正在使用两个下拉菜单.

drop1值包含8
drop2 alues包含6.

我的验证是drop2的值应该总是更大.
它将仅验证10个及以上的值，而不验证小于10的值.

问题是什么...

看到我的代码

I am using two drop down.

drop1 values contains 8
drop2 alues contains 6.

My validation is drop2 values should be greater always.
It will validate only 10 and above not validating less than 10.

what is the proplem...

see my code

If Trim(drp1.SelectedValue) < Trim(drp2.SelectedValue) Then
           Dim myscript As String = "alert('To values should be greater than from values');"
           System.Web.UI.ScriptManager.RegisterClientScriptBlock(Me.Page, Me.GetType(), "myscript", myscript, True)
           drpFrmWk.Focus()
           Flag = False
           Return 0
End If

推荐答案

进行检查.您正在比较字符串而不是整数.

Check with this. You are comparing strings instead of integers.

If Convert.ToInt32(Trim(drp1.SelectedValue)) < Convert.ToInt32(Trim(drp2.SelectedValue)) Then

尝试以下

Try the following

if (int.Parse(ddl1.SelectedValue.Trim()) >int.Parse(ddl2.SelectedValue.Trim()))
            {
                ScriptManager.RegisterStartupScript(this,this.GetType(),"Test","alert('To value must be greater than from value');",false);

            }

Dropdownlist选定的值将采用字符串格式，因此，如果您想比较整数值，则必须使用任何解析/转换方法将它们转换为整数

希望这会有所帮助.

Dropdownlist selected value will be in string format so if you wanna compare the integer values you have to convert them into intergers using any parse/converstion methods

Hope this helps.

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