WebClient類比網頁提交表單

    最近學習Asp.net開發，迷上了Http的傳輸，小試牛刀！

1、Web頁面：

　　很簡單的一個頁面，功能填入一些資料，儲存到伺服器C盤的一個檔案，：

前台：

View Code

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="Nankang.Test.Default" %><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head runat="server">    <title>儲存</title></head><body>    <form id="form1" runat="server" enableviewstate="False">    <div>        <asp:TextBox ID="m_TextBox" runat="server" Height="111px" Width="291px"></asp:TextBox>        <br />        <asp:Button ID="m_Button" runat="server" Text="儲存" onclick="m_Button_Click" />        <asp:Label ID="m_Label" runat="server" Text="..."></asp:Label>        <br />    </div>    </form></body></html>

後台：

View Code

   protected void m_Button_Click(object sender, EventArgs e)        {            StreamWriter sw = null;            try            {                string dir = @"C:\Test\";                if (Directory.Exists(dir) == false)                {                    Directory.CreateDirectory(dir);                }                string path = dir + DateTime.Now.ToString("yyyyMMddHHmmss") + ".txt";                FileStream fs = new FileStream(path, FileMode.Create);                sw = new StreamWriter(fs);                sw.WriteLine(this.m_TextBox.Text);                this.m_Label.Text += "儲存成功!";            }            catch (Exception ex)            {                this.m_Label.Text = ex.Message;            }            finally            {                if (sw != null)                {                    sw.Close();                }            }        }

2、在WinForm中，用WebClient，調用Post方法，發送資料

頁面：

後台關鍵代碼：

View Code

 WebClient webClient = new WebClient();            byte[] responseData = webClient.DownloadData(uriString);            string srcString = Encoding.UTF8.GetString(responseData);            webClient = new WebClient();            webClient.Headers.Add("Content-Type", "application/x-www-form-urlencoded");             //VeiwState                    string viewStateFlag = "id=\"__VIEWSTATE\" value=\"";             int i = srcString.IndexOf(viewStateFlag) + viewStateFlag.Length;            int j = srcString.IndexOf("\"", i);            string viewState = srcString.Substring(i, j - i);            //EventValidation            string eventValidationFlag = "id=\"__EVENTVALIDATION\" value=\"";            i = srcString.IndexOf(eventValidationFlag) + eventValidationFlag.Length;            j = srcString.IndexOf("\"", i);            string eventValidation = srcString.Substring(i, j - i);            //擷取頁面的章數             string viewmenuid = "<input name=\"txt_menuid\" type=\"text\" value=\"";            i = srcString.IndexOf(viewmenuid) + viewmenuid.Length;            j = srcString.IndexOf("\"", i);            string txt_menuid = srcString.Substring(i, j - i);            //提交按鈕的文本             string submitButton = "儲存";             bookTitle = System.Web.HttpUtility.UrlEncode(bookTitle);            viewState = System.Web.HttpUtility.UrlEncode(viewState);            eventValidation = System.Web.HttpUtility.UrlEncode(eventValidation);            txt_menuid = System.Web.HttpUtility.UrlEncode(txt_menuid);            submitButton = System.Web.HttpUtility.UrlEncode(submitButton);            string postString = "__VIEWSTATE=" + viewState + "&__EVENTVALIDATION=" + eventValidation + "&m_TextBox=" + bookTitle + "&m_Button=" + submitButton;                        // 將字串轉換成位元組數組             byte[] postData = Encoding.ASCII.GetBytes(postString);            responseData = webClient.UploadData(uriString, "POST", postData);                     srcString = Encoding.UTF8.GetString(responseData);            MessageBox.Show("儲存成功！");

3、Code

源碼下載

僅供參考，謝謝。