Web服务的调用

1.创建服务引用

例如：天气预报

2.在代码添加引用空间

   TvProgram.ChinaTVprogramWebService tp = new TvProgram.ChinaTVprogramWebService();
         DataSet ds=    tp.getAreaDataSet();

3.引用具体方法

  private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
         {
             ComboBox cb = (ComboBox)sender;
             if(comboBox1.SelectedIndex>)
             { 

              int num= Convert.ToInt32(cb.SelectedValue.ToString());

              TvProgram.ChinaTVprogramWebService tp = new TvProgram.ChinaTVprogramWebService();
              DataSet ds = tp.getTVstationDataSet(num);
              comboBox2.DataSource = ds.Tables[];
              comboBox2.DisplayMember = "tvStationName";
              comboBox2.ValueMember = "tvStationID";

             }
         }

返回的xml用两种处理方法

  //DataRow[] dt = ds.Tables[0].Select();
       //for (int i = 3; i < dt.Length; i++)
       //{
       //    Text = dt[i]["Area"].ToString();
       //   Value = Convert.ToInt32(dt[i]["areaID"].ToString());
        //    comboBox1.Items.Add(Text);
       //}
       

 comboBox1.DataSource = ds.Tables[];
        comboBox1.DisplayMember = "Area";
        comboBox1.ValueMember = "areaID";