tạo webservice giải phương trình bậc hai

Posted: 15/06/2011 in ASP.NET, C# Window Form
Tags: , ,

bài này tôi sẽ hướng dẫn các bạn tạo 1 webservice đơn giản , giải phương trình bậc 2 : aX*X+bX+c=0

1.Tạo webservice

đầu tiên tôi tạo 1 solution với tên WebservicePTBH


File Service1.asmx.cs tôi chỉnh sửa lại như sau

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

namespace WebServicePTBH

[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]

public class Service1 : System.Web.Services.WebService

public string GiaiPT(float a, float b, float c)
string ketluan = "";
float delta = b * b - 4 * a * c;
if (a == 0)
if (b == 0)
if (c == 0) ketluan = "Vô số nghiệm";
else ketluan = "Vô nghiệm";
else ketluan = "Có 1 nghiệm : X=" + (c / b);
if (delta < 0) ketluan = "Vô nghiệm";
else if (delta == 0) ketluan = "Có nghiệm kép X1=X2=" + (-b / 2 / a);
else ketluan = "Có 2 nghiệm phân biệt :  X1=" + ((-b + Math.Sqrt(delta)) / 4 / a)
                   + " , X2=" + ((-b - Math.Sqrt(delta)) / 4 / a);
return ketluan;

khi nhấn F5 để run service này , tôi được địa chỉ sau : http://localhost:9810/Service1.asmx
ghi nhớ lấy địa chỉ này

2.Test webservice vừa tạo

tôi gõ địa chỉ trên ( http://localhost:9810/Service1.asmx ) vào trình duyệt web


bấm vào GiaiPT


điền tham số a,b,c nhấn Invoke ta được kết quả


ok ! đã xây dựng thành công service

3.Sử dụng webservice vừa tạo trong window form , webform

ta tạo 2 project winform,webform trong solution


tiếp theo tôi add reference webservice lần lượt cho 2 project này

chuột phải vào Reference của mỗi project chọn Add Service Reference sẽ được bảng sau


điền địa chỉ mà tôi đã lưu ý ở trên , sau đó đặt tên là ZstarService và nhấn OK

trong Form1.cs tôi code như sau :

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace test_service
public partial class Form1 : Form
public Form1()
private ZstarService.Service1SoapClient soap;
private void Form1_Load(object sender, EventArgs e)


private void button1_Click(object sender, EventArgs e)
if (soap == null) soap = new ZstarService.Service1SoapClient();
float a, b, c;
a = float.Parse(this.textBox1.Text);
b = float.Parse(this.textBox2.Text);
c = float.Parse(this.textBox3.Text);
this.label5.Text = "Kết quả : " + soap.GiaiPT(a, b, c);
catch { }

trong Default.aspx.cs tôi code như sau :

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

namespace test_service_Webform
public partial class _Default : System.Web.UI.Page

protected void Page_Load(object sender, EventArgs e)


protected void Button1_Click(object sender, EventArgs e)

ZstarService.Service1SoapClient soap = new ZstarService.Service1SoapClient();
float a, b, c;
a = float.Parse(this.TextBox1.Text);
b = float.Parse(this.TextBox2.Text);
c = float.Parse(this.TextBox3.Text);
this.Label1.Text = "Kết quả : " + soap.GiaiPT(a, b, c);


Kết quả :

khi run project winform


khi run project webform


vừa rồi tôi đã hướng dẫn các bạn tạo 1 webservice,test webservice,sử dụng webservice

lưu ý : webservice vừa tạo ở trên , có thể sử dụng cho các ngôn ngữ khác như java,C++…

nếu dùng ngôn ngữ khác thì ko thể gọi tường minh như trên được mà phải dựa vào giá trị xml mà webservice trả về để đọc kết quả

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