常用第三方控制項
添加第三方控制項
在工具箱任意一個選項卡中單擊右鍵——再單擊選擇項——在選擇工具箱項中的.NET Framework 組建中——單擊瀏覽——在彈出的對話方塊中尋找要添加的第三方控制項——單擊開啟——最後單擊確定使用FreeTextBox線上編輯錄入控制項
1、添加FreeTextBox到標準工具箱——在頁面中添加FreeTextBox控制項即可
2、FreeTextBox控制項常用屬性
3、設定FreeTextBox控制項Text屬性實現綁定資料(必須使用Bind進行資料繫結,如果使用Eval將無法完成目錄的更新)例:
<FTB:FreeTextBox---ID="FreeTextBox1"--runat="server"--Text='<%#Bind("Name")%>'></FTB:FreeTextBox>
4、錯誤處理
錯誤提示:從用戶端中檢測到有潛在危險的Request.From 值
錯誤原因:這是由於Asp.Net自身安全機制引起的,它屏蔽了有潛在危險的表單提交。
解決方案:在Page指令上設定ValidateRquest="false" 就可以了
使用驗證碼控制項
1、添加SerialNumber控制項到標準工具箱——在頁面中添加SerialNumber控制項
2、在後置代碼中編輯驗證代碼
//首次載入處理
protected void Page_Load(object sender, EventArgs e){
if (!IsPostBack) {
this.SerialNumber1.Create(); //首次載入頁面建立新驗證碼
}}
//判斷輸入的驗證碼是否正確,並做出相應的顯示
protected void Button1_Click(object sender, EventArgs e){
if (SerialNumber1.CheckSN(this.TextBox1.Text.Trim()))
{ this.Label1.Text = "<script>alert('正確!');</script>";
} else {
SerialNumber1.Create();
}}
常用屬性和方法 |
傳回型別 |
方法名 |
說明 |
void |
Create() |
建立新驗證碼 |
bool |
CheckSN(比較參數) |
驗證輸入的驗證碼是否正確 |
session 產生驗證碼
1、編寫產生的驗證碼頁面(GenerateSureCode.aspx)
using System;using System.Data;using System.Configuration;using System.Collections;using System.Web;
using System.Web.Security;using System.Web.UI;using System.Web.UI.WebControls;using System.Web.UI.WebControls.WebParts;using System.Web.UI.HtmlControls;using System.Drawing;
public partial class GenerateSureCode : System.Web.UI.Page{
protected void Page_Load(object sender, EventArgs e) {
if (!Page.IsPostBack) {
this.GenImg(this.GenCode(4));
} }
//產生隨機字串
private string GenCode(int num) {
string[] source ={"0","1","2","3","4","5","6","7","8","9",
"A","B","C","D","E","F","G","H","I","J","K","L","M","N",
"O","P","Q","R","S","T","U","V","W","X","Y","Z","a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p","q","r","s","t","u","v","w","x","y","z"};
string code = "";
Random rd = new Random();
for (int i = 0; i < num; i++) {
code += source[rd.Next(0, source.Length)];
}
return code; }
//產生圖片
private void GenImg(string code) {
Bitmap myPalette = new Bitmap(60, 20);//定義一個畫板
Graphics gh = Graphics.FromImage(myPalette);//在畫板上定義繪圖的執行個體
Rectangle rc = new Rectangle(0, 0, 60, 20);//定義一個矩形
gh.FillRectangle(new SolidBrush(Color.Yellow), rc);//填充矩形
gh.DrawString(code, new Font("宋體", 16), new SolidBrush(Color.Red), rc);//在矩形內畫出字串
myPalette.Save(Response.OutputStream, System.Drawing.Imaging.ImageFormat.Jpeg);//將圖片顯示出來
Session["ValidateCode"] = code;//將字串儲存到Session中,以便需要時進行驗證
gh.Dispose(); myPalette.Dispose();
} }
2在頁面中加一個Image圖片控制項(通過ImageUrl屬性獲得在GenerateSureCode.aspx頁面產生的驗證碼)
<asp:Image ID="imgValidate" ImageUrl="~/GenerateSureCode.aspx" runat="server" />
3、在後置代碼中編寫如下代碼
//此方法驗證使用者輸入的驗證碼是否與產生的驗證碼一樣
private bool CheckSN() {
string validateCode = Session["ValidateCode"].ToString();//獲得儲存在Session中的驗證碼
if (this.txtValidate.Text != validateCode) {
Response.Write("<script>alert('驗證碼輸入錯誤,請重新輸入!');</script>");
txtValidate.Text = "";
return false;
} else {
return true;
} }