VB. NET, C #. NET calls Web Service and uses the implementation method of visual studio,

VB. NET, C #. NET calls Web Service and uses the implementation method of visual studio,

Call the services provided by Web Service in VB. NET

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The following is a detailed article. In fact, the specific operation is very simple. Add the Web Service address and the tool (VS2010) to the project by adding references.

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When the Web Service is already providing external services, VB. NET can use these services through HTTP "call. Of course, the premise is to understand the URL of the Web Service to provide external services. After learning about the URL of the Web Service, VB. NET is like using a local class library to use various functions provided by Web Service. Therefore, some people say that Web services are essentially a way to call Remote components over HTTP. For more information about how to add Web services to VB. NET, see Step 7 in the following steps.

The database application described below is to bind data to the DataGrid component in the program by using the "Binding" Service provided in the Web Service above, you can use the "Update" Service provided in Web Service to modify the database through the DataGrid in the program. The following describes how to compile a database application by using VB. NET to call the Web Service:
1. Start Visual Studio. Net.
2. Select File, new, and project. The new project dialog box is displayed.
3. Set project type to Visual Basic Project ].
4. Set template to Windows application ].
5. Enter TestWebService In the Name text box ].
6. in the location text box, enter E: \.. NET project, and then click OK. the "TestWebService" folder is generated in the "NET project", which stores all files of the TestWebService project.
7. select Solution Explorer | reference, right-click, and choose add Web reference from the shortcut menu ], in the Add Web reference dialog box that appears, enter "" in the address text box and click Enter. The page shown in Figure 03 is displayed. Click Add reference in Figure 03 to add a Web reference to the TestWebService project. Note that "" is the URL address of the Web Service provided to external users.
8. Drag the following components to Form1 form from the Windows Forms components tab in the toolbox and perform the corresponding operations:
◆ DataGrid component.
◆ Button components: Button1 to Button2, drag the design form of Form1 into the buttons, and double-click them, respectively, the system generates the processing code corresponding to the Click events of the two components in the Form1.vb file.

Set VB. the current window of NET switches to the code editing window of Form1.vb, and replaces the processing code corresponding to the Click event of Button1 in Form1.vb with the following code, the following code functions bind data to the DataGrid component using the "Binding" Service provided by Web Service:

　　　　Private Sub Button1_Click (   　　ByVal sender As System.Object , ByVal e As System.EventArgs )   　　Handles Button1.Click  　　Dim MyService As New localhost.Service1 ( )  　　DataGrid1.DataSource = MyService.Binding ( )  　　DataGrid1.DataMember = "Cust" 　　End Sub  

Use the following code to replace the processing code corresponding to the Click event of Button2 in Form1.vb. The following code function is to use the "Update" Service provided by Web Service to modify database data through the DataGrid:

　　　　Private Sub Button2_Click (  　　ByVal sender As System.Object , ByVal e As System.EventArgs )   　　Handles Button2.Click  　　Dim MyService As New localhost.Service1 ( )  　　Dim ds As DataSet = DataGrid1.DataSource  　　Dim dsChanges As DataSet = ds.GetChanges ( )  　　If Not ( dsChanges Is Nothing ) Then  　　ds.Merge ( MyService.Update ( dsChanges ) , True )  　　End If  　　End Sub  

So far, all the work of the TestWebService project has been completed. It is very easy to call the Web Service. Click the shortcut key F5 to run the program. Click the "bind" button in the program to bind data to the DataGrid component in the program. Click the "modify" button in the program to update the database according to the content in the DataGrid.