WCF / ASMX :: Xml Processing Instructions In XmlDocument Returned By Web Service
Jan 20, 2010
I'm having a confusing issue concerning web services, XmlDocument return type and XmlProcessingInstruction. I've basically got a web service that returns an XmlDocument containing a list of search results. In order to make it a little more user-friendly, I'd like the XmlDocument to include a Processing Instruction (<?xml-stylesheet type='text/xsl' href='book.xsl'?>) for the inclusion of an XSL stylesheet. Is there something in the ASP.NET pipeline that would prevent this? I'm using the following code (lifted from the MSDN documentation of the CreateProcessingInstruction() method) in a test WebMethod and it doesn't seem to include the processing instruction.
[Code]....
All I'm getting in the response is the following:
[Code]....
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May 12, 2010
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Jan 3, 2011
A sample web service app I have been practicing with has two web methods:
1) HelloWorld -- which I can read the data from no problem - just a string
2) ClientData[] -- which returns an array of struct objects -- this is where I have the question.
Here is my instantiation of the webservice in my winform app for reading from HelloWorld
myWebSvc1.WebService1 s1 = new myWebSvc1.WebService1();
string y = s1.HelloWorld(); //--no problems so far here
Console.WriteLine(y);
//--but when I add the call to GetClientData() I have a problem
List<ClientData> ls = new List<ClientData>(s1.GetClientData(3)); //--problem here
public struct ClientData
{
public String Name;
public int ID;
}
[WebMethod(CacheDuration = 30,
Description="Returns an array of Clients.")]
public ClientData[] GetClientData(int Number)
{
ClientData [] Clients = null;
if (Number > 0 && Number <= 10)
{
Clients = new ClientData[Number];
for (int i = 0; i < Number; i++)
{
Clients[i].Name = "Client " + i.ToString();
Clients[i].ID = i;
}
}
return Clients;
}
If I browse the .asmx file -- the sample xml returns the following if I enter 3 for GetClientData function param
<?xml version="1.0" encoding="utf-8" ?>
- <ArrayOfClientData xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns="http://codeproject.com/webservices/">
- <ClientData>
<Name>Client 0</Name>
<ID>0</ID>
</ClientData>
- <ClientData>
<Name>Client 1</Name>
<ID>1</ID>
</ClientData>
- <ClientData>
<Name>Client 2</Name>
<ID>2</ID>
</ClientData>
</ArrayOfClientData>
From my winform app I get the following error messages when trying to add the GetClientData function call above --
Error 1 The best overloaded method match for 'System.Collections.Generic.List<DSS_2008.Form7.ClientData[]>.List(System.Collections.Generic.IEnumerable<DSS_2008.Form7.ClientData[]>)' has some invalid arguments
Error 2 Argument '1': cannot convert from 'DSS_2008.myWebSvc1.ClientData[]' to 'System.Collections.Generic.IEnumerable<DSS_2008.Form7.ClientData[]>'
Error1 The best overloaded method match for 'System.Collections.Generic.List<DSS_2008.Form7.ClientData[]>.List(int)' has some invalid arguments
Error 2 Argument '1': cannot convert from 'DSS_2008.myWebSvc1.ClientData[]' to 'int'
How can I fix this so that I can read the result into my winform app?
//--sample web service
namespace MyService
{
using System;
using System.Collections;
using System.Data;
using System.Web;
using System.Web.Services;
public struct ClientData
{
public String Name;
public int ID;
}
/// <summary>
/// Summary description for WebService1.
/// </summary>
[WebService(Namespace="http://codeproject.com/webservices/",
Description="This is a demonstration WebService.")]
public class WebService1 : System.Web.Services.WebService
{
//--source of sample:
http://www.codeproject.com/KB/webservices/myservice.aspx
private const int CacheHelloWorldTime = 10; // seconds
public WebService1()
{
//CODEGEN: This call is required by the ASP+ Web Services Designer
InitializeComponent();
}
/// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
private void InitializeComponent()
{
}
//WEB SERVICE EXAMPLE
//The HelloWorld() example service returns the string Hello World
//To build, uncomment the following lines then save and build the project
//To test, right-click the Web Service's .asmx file and select View in Browser
//
[WebMethod(CacheDuration = CacheHelloWorldTime,
Description="As simple as it gets - the ubiquitous Hello World.")]
public string HelloWorld()
{
return "Hello World bbb";
}
[WebMethod(CacheDuration = 30,
Description="Returns an array of Clients.")]
public ClientData[] GetClientData(int Number)
{
ClientData [] Clients = null;
if (Number > 0 && Number <= 10)
{
Clients = new ClientData[Number];
for (int i = 0; i < Number; i++)
{
Clients[i].Name = "Client " + i.ToString();
Clients[i].ID = i;
}
}
return Clients;
}
}
}
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/*
string[] stringset = new string[10];
poclib caller = new poclib();
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*/
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