在 Visual C# .NET 中将 Web 服务用作客户端应用程序的数据源

[code]//Use data access objects from the SqlClient namespace.
using System.Data.SqlClient;

[code]public Service1()
{
//CODEGEN: This call is required by the ASP.NET Web Services Designer.
InitializeComponent();
}

[code][WebMethod]
public string CountWords(string Sentence)
{
string[] Words = Sentence.Split(' ');
return "Your sentence contains " + Words.Length + " word(s).";
}
[WebMethod]
public DataSet GetCustOrders(string IDMask)
{
IDMask = IDMask.Replace("'", "''");
//IDMask is the Customer ID that the client submits.
//Replace single quotation marks with two single quotation marks
//so that all single quotation marks in the CustomerID are parsed correctly.

//Modify this connection string to use your SQL Server and log on information.
SqlConnection con = new SqlConnection("server=<your server>;uid=<your user id>;
pwd=<your Password>;database=northwind");

//Open the Customers table to serve as the parent table.
SqlDataAdapter daCust = new SqlDataAdapter("Select * From Customers
Where CustomerID Like '%" + IDMask + "%'", con);

//Open the Orders table to serve as the child table.
SqlDataAdapter daOrders = new SqlDataAdapter("Select * From Orders
Where CustomerID Like '%" + IDMask + "%'", con);

//Create a client-side DataSet to hold the Customers and Orders tables.
DataSet ds=new DataSet();

//Explicitly open the connection to allow explicit closing.
con.Open();

//Fill the DataSet with the Customers table and the Orders table.
daCust.Fill(ds, "Cust");
daOrders.Fill(ds, "Orders");

//Explicitly close the connection - don't wait for garbage collection.
con.Close();

//Relate Customers to Orders.
ds.Relations.Add("CustOrd", ds.Tables["Cust"].Columns["CustomerID"],
ds.Tables["Orders"].Columns["CustomerID"]);

//The relationship is Orders nested within Customers.
ds.Relations[0].Nested = true;

//Return the DataSet to the client.
return ds;
}

[code]       //Use the Web Service that your Web server provides.
localhost.Service1 MyService = new localhost.Service1();
//Invoke the public WebMethod that returns a DataSet.
//Bind the DataGrid to the returned DataSet.
dataGrid1.DataSource = MyService.GetCustOrders(textBox1.Text);
dataGrid1.DataMember = "Cust";