WCF / ASMX :: Standardizing Interfaces To External Clients To Consume Wcf Services
Jul 9, 2010
I have a build a new 3 tier application (Web,Application,Data tier). The application tier (middle tier) will host wcf web services. I build my service classes, define bindings , contracts etc which does the core business logic, data access and updates.
Now I have around 50 external clients who would want services from my application tier. But my problem is client A might send a flat file request, client B might sends a comma separated file request, client C might be a soap request. The requests further may be either real time or batch. My services may have to send data back to the caller either in a flat file.., xml or a soap response or other formats. The response might also be either batch or real time.
1)Is there a way to standardize the interface for all these 50 clients accessing my WCF services ?
2) If an external client sends a flat file via FTP (intended to serve as input to my service), how do I get this flat file data to hit my service. (Assuming that the legacy system is not service based and hence the external client just sends a file and is not aware of any services of the new system)
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[Code]....
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Line: 49 Stack Trace:
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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;
}
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<?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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[URL]
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Here is my sample AddItem() and GetAllItems() prototype
Collapse | Copy Code
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