在代码隐藏中为动态生成的gridview创建一个mailto链接 [英] Creating a mailto link in codebehind for a dynamically generated gridview
问题描述
我正在为我的学校开展内部目录服务，并且在代码隐藏时在动态生成的gridview上创建mailto：链接时出现问题。
$ b After我发现Hyperlinkfields不支持：字符 - mailto：链接不可能。
因为我是动态的生成Gridviews以允许通过头进行分组，我在代码隐藏中完成了这一切。 Gridviews是从数据源读取创建的，并添加到aspx页面上的占位符标记以及定义该组的相应标签。
public void GenerateDynamicGVs（）
{
// ...
DataTable dt = new DataTable（）;
// ...
using（SqlDataReader dr = DBUtility.ExecuteReader（cmd，www_ConMasterDBString））
{
dt.Load（dr）;
var query = dt.AsEnumerable（）
.GroupBy（r => r.Field< string>（GroupName））
.Select（grp =>新
{
GroupName = grp.Key，
}）
.OrderBy（o => o.GroupName）
.ToList（）;
foreach（查询中的var项）
{
标签NewLabel = new Label（）;
NewLabel.Text = item.GroupName;
NewLabel.CssClass =DirectoryHeaders;
GridView newGV = new GridView（）;
newGV.CssClass =CONServices;
newGV.ShowHeader = false;
newGV.AutoGenerateColumns = false;
newGV.DataSource = dt.AsEnumerable（）。Where（p => p.Field< string>（GroupName）== item.GroupName）
.Select（p => new $ toString（），
EntryName = p [EntryName]。ToString（），
EntryNumber = p [EntryNumber] b $ b {
id = p [id]。 ToString（），
EntryName = p [EntryName] .ToString（） ] .ToString（）
}）;
HyperLinkField hlName = new HyperLinkField（）;
BoundField bfNumber = new BoundField（）;
BoundField bfContact = new BoundField（）;
hlName.DataNavigateUrlFields = new string [] {dt.Columns [4] .ToString（）};
hlName.DataTextField = dt.Columns [1] .ToString（）;
hlName.DataNavigateUrlFormatString =mailto：{0}; //此行执行，但由于冒号而不是可点击的链接。
bfNumber.DataField = dt.Columns [2] .ToString（）;
bfContact.DataField = dt.Columns [3] .ToString（）;
newGV.Columns.Add（hlName）;
newGV.Columns.Add（bfNumber）;
newGV.Columns.Add（bfContact）;
divPlaceHolder.Controls.Add（NewLabel）;
divPlaceHolder.Controls.Add（newGV）;
newGV.DataBind（）;
}
dr.Close（）;
是否有创建mailto链接的好方法代码隐藏？由于需要动态创建，我无法将其转换为aspx文件。我在这里错过了什么吗？任何帮助或建议，不胜感激。编辑：链接需要显示名称而不是电子邮件地址，需要从数据表中调用两列：[1]和[4]。
/ p>让它工作，代码全部在下面。
其中，我的gridview东西是：
tfName.ItemTemplate = new NameColumn（）;
TemplateField所需的类。这对于文字标签来说有点麻烦，但是我为能够运行的解决方案感到高兴：
class NameColumn：ITemplate
{
public void InstantiateIn（System.Web.UI.Control container）
{
Literal lit1 = new Literal（）;
Literal litName = new Literal（）;
Literal lit3 = new Literal（）;
Literal litEmail = new Literal（）;
Literal lit5 = new Literal（）;
lit1.Text =< a href = \mailto：;
lit3.Text =\>;
lit5.Text =< / a>;
litEmail.DataBinding + = new EventHandler（LabelEmailDatabinding）;
litName.DataBinding + = new EventHandler（LabelNameDatabinding）;
container.Controls.Add（lit1）;
container.Controls.Add（litEmail）;
container.Controls.Add（lit3）;
container.Controls.Add（litName）;
container.Controls.Add（lit5）;
private void LabelNameDatabinding（object sender，EventArgs e）
{
Literal lit =（Literal）sender;
GridViewRow row =（GridViewRow）lit.NamingContainer;
lit.Text = DataBinder.Eval（row.DataItem，EntryName）。ToString（）;
private void LabelEmailDatabinding（object sender，EventArgs e）
{
Literal lit =（Literal）sender;
GridViewRow row =（GridViewRow）lit.NamingContainer;
lit.Text = DataBinder.Eval（row.DataItem，Email）。ToString（）;
if（lit.Text == null）
{
lit.Text =test;
好的，抱歉，您需要切换到绑定字段与超链接字段的mailto。显然，DataNavigateUrlFormatString中的：存在问题。
参考： http://forums.asp.net/t/1014242.aspx?How+to+create+mailto+in+gridview+
<所以你真正需要做的是
$ b $ pre $
BoundField hlName = new BoundField（）;
hlName.DataField = dt.Columns [1] .ToString（）;
hlName.DataFormatString =< a href = \mailto：{0} \> {0}< / a>;
hlName.HtmlEncodeFormatString = false;
这可以解决您的问题。
I am working on an internal directory service for my school and am having a problem creating "mailto:" links on a dynamically generated gridview from the codebehind.
After tinkering around for a while with this, I found out that Hyperlinkfields do not support the ":" character- making "mailto:" links not possible.
Because I am dynamically generating the Gridviews to allow for grouping by header, I am doing it all in the codebehind. The Gridviews are created reading from a datasource and added to a placeholder tag on the aspx page along with a corresponding label defining the group.
public void GenerateDynamicGVs()
{
//...
DataTable dt = new DataTable();
//...
using (SqlDataReader dr = DBUtility.ExecuteReader(cmd, "www_ConMasterDBString"))
{
dt.Load(dr);
var query = dt.AsEnumerable()
.GroupBy(r => r.Field<string>("GroupName"))
.Select(grp => new
{
GroupName = grp.Key,
})
.OrderBy(o => o.GroupName)
.ToList();
foreach (var item in query)
{
Label NewLabel = new Label();
NewLabel.Text = item.GroupName;
NewLabel.CssClass = "DirectoryHeaders";
GridView newGV = new GridView();
newGV.CssClass = "CONServices";
newGV.ShowHeader = false;
newGV.AutoGenerateColumns = false;
newGV.DataSource = dt.AsEnumerable().Where(p => p.Field<string>("GroupName") == item.GroupName)
.Select(p => new
{
id = p["id"].ToString(),
EntryName = p["EntryName"].ToString(),
EntryNumber = p["EntryNumber"].ToString(),
EntryContact = p["EntryContact"].ToString(),
Email = p["Email"].ToString(),
GroupName = p["GroupName"].ToString()
});
HyperLinkField hlName = new HyperLinkField();
BoundField bfNumber = new BoundField();
BoundField bfContact = new BoundField();
hlName.DataNavigateUrlFields = new string[] { dt.Columns[4].ToString() };
hlName.DataTextField = dt.Columns[1].ToString();
hlName.DataNavigateUrlFormatString = "mailto:{0}"; //This line executes, but is not a clickable link because of the colon.
bfNumber.DataField = dt.Columns[2].ToString();
bfContact.DataField = dt.Columns[3].ToString();
newGV.Columns.Add(hlName);
newGV.Columns.Add(bfNumber);
newGV.Columns.Add(bfContact);
divPlaceHolder.Controls.Add(NewLabel);
divPlaceHolder.Controls.Add(newGV);
newGV.DataBind();
}
dr.Close();
}
}
Is there a good way to create a mailto link in the codebehind? I can't convert it to the aspx file because of the need for dynamic creation. Am I missing something here? Any help or advice is greatly appreciated. Thanks.
EDIT: The link needs to have the name displayed rather than the email address, requiring calling two columns from the datatable: [1] and [4].
Got it working, code is all below.
Where my gridview stuff is:
tfName.ItemTemplate = new NameColumn();
The class that was required for the TemplateField. It is a bit messy with the literal tags, but I am just happy for a solution that worked:
class NameColumn : ITemplate
{
public void InstantiateIn(System.Web.UI.Control container)
{
Literal lit1 = new Literal();
Literal litName = new Literal();
Literal lit3 = new Literal();
Literal litEmail = new Literal();
Literal lit5 = new Literal();
lit1.Text = "<a href=\"mailto:";
lit3.Text = "\">";
lit5.Text = "</a>";
litEmail.DataBinding += new EventHandler(LabelEmailDatabinding);
litName.DataBinding += new EventHandler(LabelNameDatabinding);
container.Controls.Add(lit1);
container.Controls.Add(litEmail);
container.Controls.Add(lit3);
container.Controls.Add(litName);
container.Controls.Add(lit5);
}
private void LabelNameDatabinding(object sender, EventArgs e)
{
Literal lit = (Literal)sender;
GridViewRow row = (GridViewRow)lit.NamingContainer;
lit.Text = DataBinder.Eval(row.DataItem, "EntryName").ToString();
}
private void LabelEmailDatabinding(object sender, EventArgs e)
{
Literal lit = (Literal)sender;
GridViewRow row = (GridViewRow)lit.NamingContainer;
lit.Text = DataBinder.Eval(row.DataItem, "Email").ToString();
if (lit.Text == null)
{
lit.Text = "test";
}
}
}
okay sorry you need to switch to a bound field vs. a hyperlinkfield for the mailto. Apparently there is a problem with the ":" in the DataNavigateUrlFormatString.
Reference: http://forums.asp.net/t/1014242.aspx?How+to+create+mailto+in+gridview+
So all you really need to do is
BoundField hlName = new BoundField();
hlName.DataField= dt.Columns[1].ToString();
hlName.DataFormatString= "<a href=\"mailto:{0}\">{0}</a>";
hlName.HtmlEncodeFormatString = false;
That should resolve your problem.
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