如何在GridView模板的下拉列表中设置谷 [英] how to set the vale in Drop down in gridview template Colums

问题描述

我正在将Gridview与Dropdown的Templete字段一起使用
在RowdtatBound，我使用一个返回数据表的函数，并将其与
绑定 DropDown的模板列.

之后，当我尝试在Dropdown的Templete Field中选择值时
它给了我
的错误
对象引用未设置为对象的实例."

尽管我尝试在下拉列表中设置的数据首先是因为我
填充下拉菜单，然后使用
设置值

I am Using Gridview with templete Field of DropDown
at RowdtatBound I Use a function which returns datatable and I bind it with
template column of DropDown.

After that when i try to select the value in templete Field of DropDown
It gives me error of

"Object reference not set to an instance of an object."

although the data which i try to set in dropdown its present becuase first i
populate the dropdown and then set the value by using

gvReading_ddlgv.Items.FindByValue(strLastReading).Selected = True

出现问题需要帮助!!!

Whts the problem Need Help !!!

推荐答案

，

手动在源文件和.cs文件中写入dropdown selectindexchanged事件，并设置autopostback = true.然后在selectedindexchanged事件中使用sender对象获取组合框selectedindex和文本，并使用dropdownlist clientid获取所选行，如

simply,

manually write dropdown selectindexchanged event in sourcefile and .cs file and set autopostback=true.then in selectedindexchanged event use sender object to retreive combobox selectedindex and text and use dropdownlist clientid to get selected row like

DropDownList ddl = (DropDownList)sender;
string s = ddl.ClientID;//use substring to retreive rowindex
if (ddl.SelectedItem.Text == "Your selected text"){dropdown1.Items.FindByText("Your text"].ToString()).Selected=true;}

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