手動發送HTTP請求調用和異步調用WebService

1、手動發送HTTP請求調用WebService

(1)、Get方式調用：

string strURL = "http://localhost:12074/Service1.asmx/GetProductPrice?ProductId=";
strURL += this.textBox1.Text;
//創建一個HTTP請求
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(strURL);
//Get請求方式
request.Method="GET";
//獲得響應流
HttpWebResponse response = (System.Net.HttpWebResponse)request.GetResponse();
Stream s = response.GetResponseStream();
XmlTextReader Reader = new XmlTextReader(s);
Reader.MoveToContent();
string strValue = Reader.ReadInnerXml();
strValue = strValue.Replace("&lt;", "<");
strValue = strValue.Replace("&gt;", ">");
MessageBox.Show(strValue);
Reader.Close();

(2)、Post方式調用：

string strURL = "http://localhost:12074/Service1.asmx/GetProductPrice";
//創建一個HTTP請求
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(strURL);
//Post請求方式
request.Method = "POST";
//內容類型
request.ContentType = "application/x-www-form-urlencoded";
//參數經過URL編碼
string paraUrlCoded = HttpUtility.UrlEncode("ProductId");
paraUrlCoded += "=" + HttpUtility.UrlEncode(this.textBox1.Text);
byte[] payload;
//將URL編碼後的字符串轉化爲字節
payload = System.Text.Encoding.UTF8.GetBytes(paraUrlCoded);
//設置請求的ContentLength
request.ContentLength = payload.Length;
//獲得請求流
Stream writer = request.GetRequestStream();
//將請求參數寫入流
writer.Write(payload, 0, payload.Length);
//關閉請求流
writer.Close();
//獲得響應流
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
Stream s = response.GetResponseStream();
XmlTextReader Reader = new XmlTextReader(s);
Reader.MoveToContent();
string strValue = Reader.ReadInnerXml();
strValue = strValue.Replace("&lt;", "<");
strValue = strValue.Replace("&gt;", ">");
MessageBox.Show(strValue);
Reader.Close();

2、異步調用WebService

(1)、利用Backgroundworker對象實現。

/// <summary>
/// 界面的進度條顯示
/// </summary>
void ChangeProcessBar()
{
for (int i = 0; i < 10; i++)
{
progressBar1.Value = i;
System.Threading.Thread.Sleep(500);
}
}
private void button1_Click(object sender, EventArgs e)
{
BackgroundWorker backgroundworker = new BackgroundWorker();
// 註冊具體異步處理的方法
backgroundworker.DoWork += new DoWorkEventHandler(back_DoWork);
// 註冊調用完成後的回調方法
backgroundworker.RunWorkerCompleted += new RunWorkerCompletedEventHandler(back_RunWorkerCompleted);
// 這裏開始異步調用
backgroundworker.RunWorkerAsync();
//調用服務的同時客戶端處理並不停止
ChangeProcessBar();
}
//完成事件
void back_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
if (e.Error != null)
throw e.Error;
progressBar1.Value = progressBar1.Maximum; //調用完成了,把客戶端進度條填充滿
string price = e.Result.ToString();   //獲取處理結果
MessageBox.Show("調用完成。價格是：" + price); //顯示從服務器獲取的結果值
}
//調用方法
void back_DoWork(object sender, DoWorkEventArgs e)
{
//Web Service代理類
ProductService.LTPService service = new ProductService.LTPService();
// 調用Web方法GetProductPrice，結果賦值給DoWorkEventArgs的Result對象
e.Result = service.GetProductPrice("001");
}

(2)、利用WebService的webMethod中的Async方法實現。

private void button2_Click(object sender, EventArgs e)
{
ProductService.LTPService service = new ProductService.LTPService();//Web Service代理類
//這裏開始異步調用
service.GetProductPriceAsync("001");
// 註冊調用完成後的回調方法
service.GetProductPriceCompleted += new ProductService.GetProductPriceCompletedEventHandler(GetProductPriceCompleted);
//調用同時客戶端處理不停止
ChangeProcessBar();
}
//完成事件
void GetProductPriceCompleted(object sender, ProductService.GetProductPriceCompletedEventArgs e)
{
if (e.Error != null)
throw e.Error;
progressBar1.Value = progressBar1.Maximum; //調用完成了,把客戶端進度條填充滿
string price = e.Result.ToString(); //獲取處理結果
MessageBox.Show("調用完成。價格是：" + price); //顯示從服務器獲取的結果值
}