I created a webcontrol with inside a dropdownlist, and exposed its
proprieties DataSource,Data Member,DataText Field,DataValue Field
But I can't set the DataSource from the aspx page
(DataSource='<% #this.DataSourc e%>' ). If I set a breakpoint inside the
DataSet propriety, I see that
the thread never reach this point, the DataSource propriety will never be
called. Why?
<%@ Register TagPrefix="wcl" Namespace="WebC ontrolLibrary1"
Assembly="WebCo ntrolLibrary1" %>
<%@ Page language="c#" Codebehind="Web Form1.aspx.cs" AutoEventWireup ="false"
Inherits="WebPr oject1.WebForm1 " %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
<HTML>
<HEAD>
<title>WebForm1 </title>
<meta name="GENERATOR " Content="Micros oft Visual Studio .NET 7.1">
<meta name="CODE_LANG UAGE" Content="C#">
<meta name="vs_defaul tClientScript" content="JavaSc ript">
<meta name="vs_target Schema"
content="http://schemas.microso ft.com/intellisense/ie5">
</HEAD>
<body MS_POSITIONING= "GridLayout "
xmlns:wcl="urn: http://schemas.myCompa ny.org/myTechnology">
<form id="Form1" method="post" runat="server">
<wcl:WebCustomC ontrol1 id="WebCustomCo ntrol11"
DataSource='<%# this.DataSource %>' DataMember="ddl " DataTextField=" text"
DataValueField= "value" style="Z-INDEX: 101; LEFT: 56px; POSITION: absolute;
TOP: 48px"
runat="server"> </wcl:WebCustomCo ntrol1>
</form>
</body>
</HTML>
namespace WebProject1
{
public class WebForm1 : System.Web.UI.P age
{
protected WebControlLibra ry1.WebCustomCo ntrol1 WebCustomContro l11;
private System.Data.Dat aSet ds;
private void Page_Load(objec t sender, System.EventArg s e)
{
if(Session["StoreData"] == null)
{
DataRow dr;
ds=new DataSet();
DataTable t=new DataTable("ddl" );
t.Columns.Add(n ew DataColumn("val ue",typeof(int) ));
t.Columns.Add(n ew DataColumn("tex t",typeof(strin g)));
t.Rows.Add(new object[]{1,"one"});
t.Rows.Add(new object[]{2,"two"});
t.Rows.Add(new object[]{3,"three"});
t.Rows.Add(new object[]{4,"four"});
this.ds.Tables. Add(t);
Session["StoreData"] = ds;
}
else ds=(DataSet)Ses sion["StoreData"];
}
public DataSet DataSource
{
get{return this.ds;}
}
}
}
namespace WebControlLibra ry1
{
[DefaultProperty ("Text"),
ToolboxData("<{ 0}:WebCustomCon trol1
runat=server></{0}:WebCustomCo ntrol1>")]
public class WebCustomContro l1 : System.Web.UI.W ebControls.WebC ontrol
{
private System.Web.UI.W ebControls.Drop DownList _dropDownList=n ew
DropDownList();
public object DataSource
{
get{return this._dropDownL ist.DataSource; }
set{this._dropD ownList.DataSou rce=value;}
}
public string DataMember
{
get{return this._dropDownL ist.DataMember; }
set{this._dropD ownList.DataMem ber=value;}
}
public string DataTextField
{
get{return this._dropDownL ist.DataTextFie ld;}
set{this._dropD ownList.DataTex tField=value;}
}
public string DataValueField
{
get{return this._dropDownL ist.DataValueFi eld;}
set{this._dropD ownList.DataVal ueField=value;}
}
protected override void Render(HtmlText Writer output)
{
this._dropDownL ist.DataBind();
this._dropDownL ist.RenderContr ol(output);
}
}
}
2  2007 
Hello:
i donot think so the DataSource propriety can be writen in .aspx page.
"Zürcher See" <aq****@cannabi smail.com> дÈëÓʼþ
news:uN******** ********@TK2MSF TNGP11.phx.gbl. .. I created a webcontrol with inside a dropdownlist, and exposed its
proprieties DataSource,Data Member,DataText Field,DataValue Field
But I can't set the DataSource from the aspx page
(DataSource='<% #this.DataSourc e%>' ). If I set a breakpoint inside the
DataSet propriety, I see that
the thread never reach this point, the DataSource propriety will never be
called. Why?
<%@ Register TagPrefix="wcl" Namespace="WebC ontrolLibrary1"
Assembly="WebCo ntrolLibrary1" %>
<%@ Page language="c#" Codebehind="Web Form1.aspx.cs"
AutoEventWireup ="false" Inherits="WebPr oject1.WebForm1 " %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
<HTML>
<HEAD>
<title>WebForm1 </title>
<meta name="GENERATOR " Content="Micros oft Visual Studio .NET 7.1">
<meta name="CODE_LANG UAGE" Content="C#">
<meta name="vs_defaul tClientScript" content="JavaSc ript">
<meta name="vs_target Schema"
content="http://schemas.microso ft.com/intellisense/ie5">
</HEAD>
<body MS_POSITIONING= "GridLayout "
xmlns:wcl="urn: http://schemas.myCompa ny.org/myTechnology">
<form id="Form1" method="post" runat="server">
<wcl:WebCustomC ontrol1 id="WebCustomCo ntrol11"
DataSource='<%# this.DataSource %>' DataMember="ddl " DataTextField=" text"
DataValueField= "value" style="Z-INDEX: 101; LEFT: 56px; POSITION:
absolute; TOP: 48px"
runat="server"> </wcl:WebCustomCo ntrol1>
</form>
</body>
</HTML>
namespace WebProject1
{
public class WebForm1 : System.Web.UI.P age
{
protected WebControlLibra ry1.WebCustomCo ntrol1 WebCustomContro l11;
private System.Data.Dat aSet ds;
private void Page_Load(objec t sender, System.EventArg s e)
{
if(Session["StoreData"] == null)
{
DataRow dr;
ds=new DataSet();
DataTable t=new DataTable("ddl" );
t.Columns.Add(n ew DataColumn("val ue",typeof(int) ));
t.Columns.Add(n ew DataColumn("tex t",typeof(strin g)));
t.Rows.Add(new object[]{1,"one"});
t.Rows.Add(new object[]{2,"two"});
t.Rows.Add(new object[]{3,"three"});
t.Rows.Add(new object[]{4,"four"});
this.ds.Tables. Add(t);
Session["StoreData"] = ds;
}
else ds=(DataSet)Ses sion["StoreData"];
}
public DataSet DataSource
{
get{return this.ds;}
}
}
}
namespace WebControlLibra ry1
{
[DefaultProperty ("Text"),
ToolboxData("<{ 0}:WebCustomCon trol1
runat=server></{0}:WebCustomCo ntrol1>")]
public class WebCustomContro l1 : System.Web.UI.W ebControls.WebC ontrol
{
private System.Web.UI.W ebControls.Drop DownList _dropDownList=n ew
DropDownList();
public object DataSource
{
get{return this._dropDownL ist.DataSource; }
set{this._dropD ownList.DataSou rce=value;}
}
public string DataMember
{
get{return this._dropDownL ist.DataMember; }
set{this._dropD ownList.DataMem ber=value;}
}
public string DataTextField
{
get{return this._dropDownL ist.DataTextFie ld;}
set{this._dropD ownList.DataTex tField=value;}
}
public string DataValueField
{
get{return this._dropDownL ist.DataValueFi eld;}
set{this._dropD ownList.DataVal ueField=value;}
}
protected override void Render(HtmlText Writer output)
{
this._dropDownL ist.DataBind();
this._dropDownL ist.RenderContr ol(output);
}
}
}
If you place a DropDownList on the page, not in a WebControl, you can set
the DataSource and it works fine.
But if I plate the DropDownList in a WebControl it does not work anymore
"Kenneth" <do*********@ho tmail.com.discu ss> schrieb im Newsbeitrag
news:%2******** *******@tk2msft ngp13.phx.gbl.. . Hello:
i donot think so the DataSource propriety can be writen in .aspx page.
"Zürcher See" <aq****@cannabi smail.com> дÈëÓʼþ
news:uN******** ********@TK2MSF TNGP11.phx.gbl. .. I created a webcontrol with inside a dropdownlist, and exposed its
proprieties DataSource,Data Member,DataText Field,DataValue Field
But I can't set the DataSource from the aspx page
(DataSource='<% #this.DataSourc e%>' ). If I set a breakpoint inside the
DataSet propriety, I see that
the thread never reach this point, the DataSource propriety will never
be called. Why?
<%@ Register TagPrefix="wcl" Namespace="WebC ontrolLibrary1"
Assembly="WebCo ntrolLibrary1" %>
<%@ Page language="c#" Codebehind="Web Form1.aspx.cs"
AutoEventWireup ="false" Inherits="WebPr oject1.WebForm1 " %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
<HTML>
<HEAD>
<title>WebForm1 </title>
<meta name="GENERATOR " Content="Micros oft Visual Studio .NET 7.1">
<meta name="CODE_LANG UAGE" Content="C#">
<meta name="vs_defaul tClientScript" content="JavaSc ript">
<meta name="vs_target Schema"
content="http://schemas.microso ft.com/intellisense/ie5">
</HEAD>
<body MS_POSITIONING= "GridLayout "
xmlns:wcl="urn: http://schemas.myCompa ny.org/myTechnology">
<form id="Form1" method="post" runat="server">
<wcl:WebCustomC ontrol1 id="WebCustomCo ntrol11"
DataSource='<%# this.DataSource %>' DataMember="ddl " DataTextField=" text"
DataValueField= "value" style="Z-INDEX: 101; LEFT: 56px; POSITION:
absolute; TOP: 48px"
runat="server"> </wcl:WebCustomCo ntrol1>
</form>
</body>
</HTML>
namespace WebProject1
{
public class WebForm1 : System.Web.UI.P age
{
protected WebControlLibra ry1.WebCustomCo ntrol1 WebCustomContro l11;
private System.Data.Dat aSet ds;
private void Page_Load(objec t sender, System.EventArg s e)
{
if(Session["StoreData"] == null)
{
DataRow dr;
ds=new DataSet();
DataTable t=new DataTable("ddl" );
t.Columns.Add(n ew DataColumn("val ue",typeof(int) ));
t.Columns.Add(n ew DataColumn("tex t",typeof(strin g)));
t.Rows.Add(new object[]{1,"one"});
t.Rows.Add(new object[]{2,"two"});
t.Rows.Add(new object[]{3,"three"});
t.Rows.Add(new object[]{4,"four"});
this.ds.Tables. Add(t);
Session["StoreData"] = ds;
}
else ds=(DataSet)Ses sion["StoreData"];
}
public DataSet DataSource
{
get{return this.ds;}
}
}
}
namespace WebControlLibra ry1
{
[DefaultProperty ("Text"),
ToolboxData("<{ 0}:WebCustomCon trol1
runat=server></{0}:WebCustomCo ntrol1>")]
public class WebCustomContro l1 : System.Web.UI.W ebControls.WebC ontrol
{
private System.Web.UI.W ebControls.Drop DownList _dropDownList=n ew
DropDownList();
public object DataSource
{
get{return this._dropDownL ist.DataSource; }
set{this._dropD ownList.DataSou rce=value;}
}
public string DataMember
{
get{return this._dropDownL ist.DataMember; }
set{this._dropD ownList.DataMem ber=value;}
}
public string DataTextField
{
get{return this._dropDownL ist.DataTextFie ld;}
set{this._dropD ownList.DataTex tField=value;}
}
public string DataValueField
{
get{return this._dropDownL ist.DataValueFi eld;}
set{this._dropD ownList.DataVal ueField=value;}
}
protected override void Render(HtmlText Writer output)
{
this._dropDownL ist.DataBind();
this._dropDownL ist.RenderContr ol(output);
}
}
}
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