free visual basic qr code generator Writing Web Part Output in .NET

Maker Code 128B in .NET Writing Web Part Output

Writing Web Part Output
Encode Code 128A In VS .NET
Using Barcode encoder for .NET Control to generate, create Code 128A image in .NET applications.
www.OnBarcode.com
Read Code 128 Code Set C In VS .NET
Using Barcode decoder for .NET framework Control to read, scan read, scan image in .NET framework applications.
www.OnBarcode.com
For an ordinary ASP.NET page or user control, the first step after creating a new file is to design the HTML. This is also true for ASP.NET custom controls (and consequently for Web Parts) but, because there s no text file that contains raw HTML, you need to approach this task differently.
Encode Bar Code In .NET
Using Barcode drawer for .NET Control to generate, create barcode image in VS .NET applications.
www.OnBarcode.com
Scanning Barcode In Visual Studio .NET
Using Barcode reader for .NET Control to read, scan read, scan image in Visual Studio .NET applications.
www.OnBarcode.com
Part VII: Developing Web Parts in Visual Studio .NET
Print Code128 In C#
Using Barcode printer for .NET Control to generate, create Code 128 image in VS .NET applications.
www.OnBarcode.com
Drawing ANSI/AIM Code 128 In VS .NET
Using Barcode encoder for ASP.NET Control to generate, create Code 128 image in ASP.NET applications.
www.OnBarcode.com
Beginning Web Part Development As you no doubt recall, every Web Part that creates output contains a method declaration like this:
Code128 Printer In VB.NET
Using Barcode drawer for Visual Studio .NET Control to generate, create Code 128 Code Set C image in Visual Studio .NET applications.
www.OnBarcode.com
1D Generation In .NET Framework
Using Barcode generator for VS .NET Control to generate, create Linear 1D Barcode image in .NET framework applications.
www.OnBarcode.com
protected override void RenderWebPart(HtmlTextWriter output) { }
2D Barcode Printer In VS .NET
Using Barcode creator for Visual Studio .NET Control to generate, create Matrix 2D Barcode image in .NET applications.
www.OnBarcode.com
Generating Denso QR Bar Code In .NET
Using Barcode generator for .NET framework Control to generate, create QR Code 2d barcode image in VS .NET applications.
www.OnBarcode.com
ASP.NET runs this function automatically after all initialization functions, event handlers, and child functions have finished in short, when all other processing is complete. To actually emit HTML, you have a choice of two approaches:
Draw Barcode In VS .NET
Using Barcode maker for VS .NET Control to generate, create bar code image in .NET applications.
www.OnBarcode.com
Uniform Symbology Specification Code 93 Maker In VS .NET
Using Barcode creator for .NET Control to generate, create Code 93 image in Visual Studio .NET applications.
www.OnBarcode.com
You can call the Write method of the HtmlTextWriter object named output. (Note that
Paint Barcode In None
Using Barcode creator for Microsoft Word Control to generate, create barcode image in Office Word applications.
www.OnBarcode.com
Drawing Barcode In Java
Using Barcode maker for Android Control to generate, create barcode image in Android applications.
www.OnBarcode.com
the RenderWebPart method receives a pointer to this object as an argument.) For example, to write a paragraph that displays the value of a variable named strMsg, you would code:
Create Barcode In VS .NET
Using Barcode creation for Reporting Service Control to generate, create bar code image in Reporting Service applications.
www.OnBarcode.com
Print Linear 1D Barcode In Visual Studio .NET
Using Barcode printer for ASP.NET Control to generate, create Linear image in ASP.NET applications.
www.OnBarcode.com
output.Write("<p>" + SPEncode.HtmlEncode(strMsg) + "</p>");
Making Code39 In Visual Studio .NET
Using Barcode maker for ASP.NET Control to generate, create USS Code 39 image in ASP.NET applications.
www.OnBarcode.com
UPC A Decoder In .NET
Using Barcode reader for Visual Studio .NET Control to read, scan read, scan image in Visual Studio .NET applications.
www.OnBarcode.com
You can call the RenderChildren method, specifying the HtmlTextWriter object named
Encoding PDF417 In None
Using Barcode encoder for Software Control to generate, create PDF417 image in Software applications.
www.OnBarcode.com
Data Matrix 2d Barcode Encoder In None
Using Barcode creation for Office Word Control to generate, create ECC200 image in Word applications.
www.OnBarcode.com
output as a parameter. Here s an example:
RenderChildren(output);
Each tag you code runat="server" creates a corresponding object in the Controls
collection.
Any content that appears between tags coded runat="server" appears in the Controls
collection as a single System.Web.UI.LiteralControl object.
19
Because custom controls (and therefore Web Parts) have no .aspx or .ascx file, the Controls collection is initially empty. You can, however, write program code that adds any controls you want to the Controls collection. Here s an example:
HtmlGenericControl prgMsg; prgMsg = new HtmlGenericControl("p"); prgMsg.InnerText = strMsg; Controls.Add(prgMsg); // // // // Declare variable. Create object. Set value inside <p> and </p>. Add to Controls collection.
19
A single call to the RenderChildren method will then tell each control, in order, to emit its HTML. If you use code such as the above to create five paragraph controls, RenderChildren would write five sets of <p> and </p> tags, each with the content you assigned.
19
To understand the RenderChildren method, you should know that every ASP.NET page, user control, and custom control has a Controls collection. This collection contains an object for each element the page or control will display. When you re working with ASP.NET pages or user controls, ASP.NET loads the Controls collection from the .aspx or .ascx file as follows:
19
SPEncode.HtmlEncode is a method that converts reserved HTML characters to character entity references. For example, it converts < to < and > to >.
19
19
Part VII: Developing Web Parts in Visual Studio .NET
Microsoft Windows SharePoint Services Inside Out The choice between using output.Write and RenderChildren is entirely yours. The output.Write method is easier to see and understand. Loading up the Controls collection and calling RenderChildren is more abstract, but it helps modularize your program and it guards against invalid HTML. Although there s nothing wrong with output.Write, the examples in this book will use the RenderChildren method exclusively.
19 19 19 19 19 19
Adding Layout Controls and Content
ASP.NET provides two sets of objects you can add to a Controls collection. They are:
System.Web.UI.HtmlControls
These controls correspond very closely to standard HTML elements. For a complete list, browse: http://msdn.microsoft.com/library/en-us/cpref/html/frlrfSystemWebUIHtmlControls.asp To use these controls, the source code for your Web Part should contain this statement:
using System.Web.UI.HtmlControls;
Otherwise, you ll need to type the entire namespace every time you refer to one of its class names.
System.Web.UI.WebControls
Controls in this group are either:
Enhanced versions of HTML server controls. Unlike the HtmlSelect control, for example, the ListBox Web server control can trigger immediate postbacks. Entirely new elements, such as a calendar, an ad rotator, and the ubiquitous DataGrid control.
For a list of these controls, browse: http://msdn.microsoft.com/library/en-us/cpref/html/frlrfSystemWebUIHtmlControls.asp To use these controls, the source code for your Web Part should contain this statement:
using System.Web.UI.WebControls;
The preceding section already showed some example code for creating a paragraph tag and adding text to it. Here it is again.
HtmlGenericControl prgMsg; prgMsg = new HtmlGenericControl("p"); prgMsg.InnerText = strMsg; Controls.Add(prgMsg);
Part VII: Developing Web Parts in Visual Studio .NET
Beginning Web Part Development In fact, however, not all this code is likely to appear together in one block. The second and fourth statements must appear within the CreateChildControls method, as shown below:
protected override void CreateChildControls () { prgMsg = new HtmlGenericControl("p"); Controls.Add(prgMsg); }
01 02 03 04 05 06 07 08 09 10 11 12 13 14 15
HtmlGenericControl prgMsg; public void MsgLoad(object sender, EventArgs e) { string strMsg; strMsg = "Help! I'm a prisoner in a Web Part!"; EnsureChildControls(); prgMsg.InnerText = strMsg; } protected override void CreateChildControls () { prgMsg = new HtmlGenericControl("p"); prgMsg.Load += new EventHandler(MsgLoad); Controls.Add(prgMsg); }
Copyright © OnBarcode.com . All rights reserved.