模板化控件示例-优快云博客

本文链接：https://blog.youkuaiyun.com/haojialin/article/details/1159528

[C#]
using System;
using System.Web;
using System.Web.UI;

namespace CustomControls
{
    [
    ParseChildren(true)
    ]
      public class TemplatedFirstControl : Control, INamingContainer
      {
            private ITemplate firstTemplate;
            private String text = null;
            private Control myTemplateContainer;

        protected override void OnDataBinding(EventArgs e) {
            EnsureChildControls();
            base.OnDataBinding(e);
        }

            [TemplateContainer(typeof(FirstTemplateContainer))]

                  public ITemplate FirstTemplate
            {
                  get
                  {
                        return firstTemplate;
                  }
                  set
                  {
                        firstTemplate = value;
                  }
            }

            public String Text
            {
                  get
                  {
                        return text;
                  }
                  set
                  {
                        text = value;
                  }
            }

            public String DateTime
            {
                  get
                  {
                        return System.DateTime.Now.ToLongTimeString();
                  }

            }

            public Control MyTemplateContainer
            {
                  get
                  {
                        return myTemplateContainer;
                  }
            }

            protected override void CreateChildControls ()

            {
                  if (FirstTemplate != null)
                  {
                        myTemplateContainer = new FirstTemplateContainer(this);
                        FirstTemplate.InstantiateIn(myTemplateContainer);
                        Controls.Add(myTemplateContainer);
                  }
                  else
                  {
                        Controls.Add(new LiteralControl(Text + " " + DateTime));
                  }
            }

      }
}

下面的控件是该模板的容器。

[C#]
using System;
using System.Web;
using System.Web.UI;

namespace CustomControls
{
public class FirstTemplateContainer : Control, INamingContainer
      {
            private TemplatedFirstControl parent;
            public FirstTemplateContainer(TemplatedFirstControl parent)
            {
                  this.parent = parent;
            }
            
            public String Text
            {
                  get
                  {
                        return parent.Text;
                  }
            }
            public String DateTime
            {
                  get 
                  {
                        return parent.DateTime;
                  }
                  
            }
      }
}
在页上使用模板化控件
下面的 ASP.NET 页使用了前述示例中定义的模板化控件。它先使用带有两个不同模板的控件，然后又使用不带模板的控件。
<%@ Register TagPrefix="Custom" Namespace="CustomControls" Assembly = "CustomControls" %>

<script runat=server language=c#>
void Page_Load() {
    First.DataBind();
    Second.DataBind();
}
</script>

<html>

   <body>
      
      <form  runat=server>
                  
          Here is a custom templated server control:<br><br>
          <Custom:TemplatedFirstControl id = "First" Text= "The time on the server is "  runat=server>                         
          <FirstTemplate>
          <h3><font face="Verdana" color = "red"><%# Container.Text %> <%# Container.DateTime %>
          </font></h3>
          </FirstTemplate>      
        </Custom:TemplatedFirstControl>
          
          Here is the templated server control with a different template:<br><br>
          <Custom:TemplatedFirstControl id = "Second" Text= "The time on the server is "  runat=server>                         
          <FirstTemplate>
          <h1><font face="Arial" color = "Purple"><%# Container.Text %> <%# Container.DateTime %>
          </font></h1>
          </FirstTemplate>     
        </Custom:TemplatedFirstControl>
           
           Here is the templated server control without a template:<br><br>
          <Custom:TemplatedFirstControl id = "Third" Text= "The time on the server is "  runat=server/>
                               
      </form>

   </body>

</html>