【C#/.Net】.Net引用web，并提取SQL数据

1.在VS中，新建一个web application，编写要用到的[webmethod]，这里我需要用到的是Product：提取数据库数据。webservice.asmx.cs文件如下。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Services;
using System.Data;
using System.Data.SqlClient;

namespace WebApplication2
{
/// <summary>
/// WebService1 的摘要说明
/// </summary>
[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
[System.ComponentModel.ToolboxItem(false)]
// 若要允许使用 ASP.NET AJAX 从脚本中调用此 Web 服务，请取消对下行的注释。
//[System.Web.Script.Services.ScriptService]
public class WebService1 : System.Web.Services.WebService
{
#region
[WebMethod(Description = "产品列表")]
public DataSet GetProducts()
{
string con =
"server = (local);database = sun;uid = sa;pwd = 123456";
SqlConnection conn = new SqlConnection(con);
//打开数据库连接
conn.Open();

SqlDataAdapter myDataAdapter;
DataSet myDataSet = new DataSet();

string cmd = "select *from Product";
myDataAdapter = new SqlDataAdapter(cmd, conn);
myDataAdapter.Fill(myDataSet,"Product");
conn.Close();
return myDataSet;
//SqlCommand cmd = new SqlCommand("downloadpic", conn);
//cmd.CommandType = CommandType.StoredProcedure;
//cmd.Parameters.Add("@Name", SqlDbType.NVarChar).Value = name;
//SqlDataReader reader = cmd.ExecuteReader();
//if (reader.Read())
}
#endregion

#region
[WebMethod]
public string  sayhello(string name)
{
return "Hello,"+name;
}
#endregion
[WebMethod]
public double addtion(double i, double j)
{
return i + j;
}
[WebMethod]
public double substract(double i, double j)
{
return i - j;
}

}
}

数据库文件如下：



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点击浏览器中查看，查看编写的method



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效果出现如图：



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将写好的web引用到网站中，新建.Net 网站，加入web引用：



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配置web选项，并加入，URL是上一步浏览器中的地址：





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编写后台程序，调用web：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{

}
protected void Button1_Click(object sender, EventArgs e)
{
localhost.WebService1 ms = new localhost.WebService1();
if (TextBox1.Text.Length > 0)
Label1.Text = ms.sayhello(TextBox1.Text);
else Label1.Text = "等待输入";
}
protected void TextBox1_TextChanged(object sender, EventArgs e)
{

}
protected void Button2_Click(object sender, EventArgs e)
{
localhost.WebService1 ms = new localhost.WebService1();
GridView1.DataSource = ms.GetProducts();
GridView1.DataBind();
}
}

运行：



点击Product：（未加入Grid控件之前）



加入Gird控件之后：点击button2后出现数据