对象引用未设置为对象的实例.[关于项目数据绑定事件] [英] Object reference not set to an instance of an object.[On item databound event]

问题描述

错误:-

string status = Convert.ToString(((HiddenField)e.Item.FindControl("hfstatus")).Value);

对象引用未设置为对象的实例.

注意:-
在数据列表项数据绑定事件中，出现此错误.
在这里，如果我以前从隐藏字段"hfstatus"中检索值，
datalist1.DataSource = dt;
datalist1.DataBind();我能够获得价值.
但是为什么我无法读取控件(或)在项目数据绑定事件中从控件读取值.

谁能帮我解决这种情况...
预先感谢....

Object reference not set to an instance of an object.

Note : -
In datalist item databound event,i''m getting this error.
Here,if i used to retrieve the value from the hidden field ''hfstatus'' after,
datalist1.DataSource = dt;
datalist1.DataBind(); this i''m able to get the value.
But why i Can''t able to read the control (or) read the value from the control on item databound event.

Can anyone help me to solve this scenario...
Thankz in Advance....

推荐答案

(HiddenField)e.Item.FindControl("hfstatus")).Value;

返回一个空值.
放置一个断点并检查该值.

补充:您需要调试并找出返回空值的原因.

is returning a null.
Put a break point and check the value.

Added: You need to debug and find out the reason why it is returning a null.

更具体地说，我敢打赌FindControl()返回空值，可能是因为控件名称区分大小写(或者您拼错了).

就像其他人所说的那样，将代码行放入try/catch块中，并检查实际引发的异常.

More specifically, I bet FindControl() is returning null, probably because the control name is case-sensitive (or you misspelled it).

Like the other guy said, put the line of code into a try/catch block and inspect the actual exception being thrown.

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