ASP.NET C＃试图隐藏链接按钮 [英] ASP.NET C# trying to hide a link button
本文介绍了ASP.NET C＃试图隐藏链接按钮的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我有点新的ASP.NET和我被迷惑的语法让我有点失落。我想根据if语句来隐藏/关闭按钮，但我不知道如何禁用或隐藏。我已经做了C＃之前，但这个code看起来生疏了。
下面是一些code的：
C＃组件：
保护覆盖无效渲染（HtmlTextWriter的作家）
{
字符串PostCtrl = Request.Params [__ EVENTTARGET]; 如果（PostCtrl ==AccColLocation_content $ collisionLocation $ EditColLocation）
{
valDropDownlist(((CustomControl.DropDownValidator)collisionLocation.FindControl(\"valLoc_municipality\")), CollisionLocation.municipality）; ..............
}
}
HTML
＆LT;＆ItemTemplate中GT;
＆LT; ASP：LinkButton的ID =EditColLocation=服务器文本=编辑碰撞位置的OnClick =CollisionLocation_Edit/＆GT;
＆LT; / ItemTemplate中＆GT;
valDropDownList方式：
保护无效valDropDownlist（CustomControl.DropDownValidator valDropdown，串DataElement）
{
尝试
{
布尔mvarRequired，srRequired;
数据表dtDataElement = DBFunctions.DBFunctions.getDataElement（RepDateTime，DataElement）;
。字符串s = dtDataElement.Rows [0] [mvarRequired]的ToString（）;
mvarRequired =（dtDataElement.Rows [0] [mvarRequired]。的ToString（）==真）？真假;
srRequired =（dtDataElement.Rows [0] [srRequired]。的ToString（）==真）？真假;
valDropdown.HaveToSelect =（SelfReported）？ srRequired：mvarRequired;
}
赶上（例外错误）
{
的MessageBox（在设置下拉验证规则时发生错误。+ err.ToString（））;
}
}
所有这些按钮都在网格视图。
我有这种性质的东西：
保护无效deletedr（对象发件人，EventArgs的发送）
{
尝试
{
GridView控件GV =（GridView控件）的FindControl（DriverInfo）;
gv.DataSource = DBFunctions.DBFunctions.getInfo（ReportID.Value，，2）; ;
gv.DataBind（）; 布尔isSelectedLast = FALSE;
DataTable的DT = DBFunctions.DBFunctions.getInfo（ReportID.Value，，2）; 如果（dlDriverNo.SelectedValue == dt.Rows [dt.Rows.Count - 1]。[DriverNo]的ToString（））
{
isSelectedLast =真;
} 如果（！（DBFunctions.DBFunctions.deleteDriver（ReportID.Value，dlDriverNo.SelectedValue，isSelectedLast）））
{
的MessageBox（NULL）;
}
其他
{
dlDriverNo.Visible = FALSE;
lblDelDriver.Visible = FALSE;
delDriverconfim.Visible = FALSE;
cancelDel.Visible = FALSE;
dlDriverNo.Items.Clear（）;
gv.DataSource = DBFunctions.DBFunctions.getInfo（ReportID.Value，，2）;
gv.DataBind（）;
}
}
赶上（例外错误）
{
的MessageBox（在删除驱动程序时出现错误。+ err.ToString（））;
}
}
解决方案
如果你的LinkButton的是在GridView，最有趣的问题越来越它的句柄。之后，你有一个手柄你可以将其设置为不可见或禁用：
linkButton.Visible = FALSE;
或
linkButton.Enabled = FALSE;
但要获得一个句柄LinkButton控件，你需要在适当的情况下使用 .FindControl 在GridView控件：
＆LT; ASP：GridView控件ID =myGridView=服务器OnRowDataBound =myGridView_RowDataBound＆GT;
...
＆LT; / aspGridView＆GT;
然后在code后面你会：
保护无效myGridView_RowDataBound（对象发件人，GridViewRowEventArgs E）
{
VAR的LinkButton =（LinkButton的）e.Row.FindControl（EditColLocation）;
如果（LinkButton的！= NULL）
{
如果（*你的病情检查*）
linkButton.Visible = FALSE;
}
}
希望这将让你在正确的方向前进。
I am somewhat new to ASP.NET and I am confused by the syntax so I am a little lost. I am trying to hide/disable a button based on an if statement but I dont know how to disable or hide it. I have done C# before but this code looks unfamiliar to me.
Below is some of the code:
C# component:
protected override void Render(HtmlTextWriter writer)
{
string PostCtrl = Request.Params["__EVENTTARGET"];
if (PostCtrl == "AccColLocation_content$collisionLocation$EditColLocation")
{
valDropDownlist(((CustomControl.DropDownValidator)collisionLocation.FindControl("valLoc_municipality")), "CollisionLocation.municipality");
..............
}
}
HTML:
<ItemTemplate>
<asp:LinkButton ID="EditColLocation" runat="server" Text="Edit Collision Location" OnClick="CollisionLocation_Edit" />
</ItemTemplate>
valDropDownList Method:
protected void valDropDownlist(CustomControl.DropDownValidator valDropdown, string DataElement)
{
try
{
bool mvarRequired, srRequired;
DataTable dtDataElement = DBFunctions.DBFunctions.getDataElement(RepDateTime, DataElement);
string s = dtDataElement.Rows[0]["mvarRequired"].ToString();
mvarRequired = (dtDataElement.Rows[0]["mvarRequired"].ToString() == "True") ? true : false;
srRequired = (dtDataElement.Rows[0]["srRequired"].ToString() == "True") ? true : false;
valDropdown.HaveToSelect = (SelfReported) ? srRequired : mvarRequired;
}
catch (Exception err)
{
MessageBox("An error occurred while setting drop down validation rules. " + err.ToString());
}
}
All these buttons are in grid view.
I have something of this nature:
protected void deletedr(object sender, EventArgs e)
{
try
{
GridView gv = (GridView)FindControl("DriverInfo");
gv.DataSource = DBFunctions.DBFunctions.getInfo(ReportID.Value, "", 2); ;
gv.DataBind();
bool isSelectedLast = false;
DataTable dt = DBFunctions.DBFunctions.getInfo(ReportID.Value, "", 2);
if (dlDriverNo.SelectedValue == dt.Rows[dt.Rows.Count - 1]["DriverNo"].ToString())
{
isSelectedLast = true;
}
if (!(DBFunctions.DBFunctions.deleteDriver(ReportID.Value, dlDriverNo.SelectedValue, isSelectedLast)))
{
MessageBox(null);
}
else
{
dlDriverNo.Visible = false;
lblDelDriver.Visible = false;
delDriverconfim.Visible = false;
cancelDel.Visible = false;
dlDriverNo.Items.Clear();
gv.DataSource = DBFunctions.DBFunctions.getInfo(ReportID.Value, "", 2);
gv.DataBind();
}
}
catch (Exception err)
{
MessageBox("An error occurred while deleting the driver. " + err.ToString());
}
}
解决方案
If your LinkButton is in a GridView, the most interesting problem is getting a handle on it. After you have a handle you can just set it to invisible or disabled:
linkButton.Visible = false;
or
linkButton.Enabled = false;
But to get a handle to the LinkButton control you will need to use .FindControl in a suitable event on the GridView control:
<asp:GridView ID="myGridView" runat="server" OnRowDataBound="myGridView_RowDataBound">
...
</aspGridView>
Then in the code behind you would have:
protected void myGridView_RowDataBound(object sender, GridViewRowEventArgs e)
{
var linkButton = (LinkButton)e.Row.FindControl("EditColLocation");
if (linkButton != null)
{
if (*your condition to check*)
linkButton.Visible = false;
}
}
Hope this will get you moving in the right direction.
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