在MVC4自定義驗證碼圖片刷新

控制器代碼：在MVC4自定義驗證碼圖片刷新

public class CaptchaImageResult : ActionResult 
{ 
    public string GetCaptchaString(int length) 
    { 
     int intZero = '0'; 
     int intNine = '9'; 
     int intA = 'A'; 
     int intZ = 'Z'; 
     int intCount = 0; 
     int intRandomNumber = 0; 
     string strCaptchaString = ""; 
     Random random = new Random(System.DateTime.Now.Millisecond); 
     while (intCount < length) 
     { 
      intRandomNumber = random.Next(intZero, intZ); 
      if (((intRandomNumber >= intZero) && (intRandomNumber <= intNine) || (intRandomNumber >= intA) && (intRandomNumber <= intZ))) 
      { 
       strCaptchaString = strCaptchaString + (char)intRandomNumber; 
       intCount = intCount + 1; 
      } 
     } 
     return strCaptchaString; 
    } 
    public override void ExecuteResult(ControllerContext context) 
    { 
     Bitmap bmp = new Bitmap(100, 30); 
     Graphics g = Graphics.FromImage(bmp); 
     g.Clear(Color.Navy); 
     string randomString = GetCaptchaString(6); 
     context.HttpContext.Session["captchastring"] = randomString; 
     g.DrawString(randomString, new Font("Courier", 16), new SolidBrush(Color.WhiteSmoke), 2, 2); 
     HttpResponseBase response = context.HttpContext.Response; 
     response.ContentType = "image/jpeg"; 
     bmp.Save(response.OutputStream, ImageFormat.Jpeg); 
     bmp.Dispose(); 
    } 
} 
    [OutputCache(NoStore = true, Duration = 0, VaryByParam = "None")] 
    public CaptchaImageResult ShowCaptchaImage(string random) 
    { 

     return new CaptchaImageResult(); 
    }

在查看我的代碼是：

<img id="CaptchaImg" src="@Url.Action("ShowCaptchaImage", "Login", new { random = Guid.NewGuid().ToString() })" alt="" /> 
<img src="~/Content/images/refresh-ico.ico" style="cursor: pointer;" id="refresh" height="30" width="30" alt="refresh" />

在刷新圖片請執行以下jQuery代碼：

$("#refresh").click(function() { 


    $.ajax({ 
     type: "GET", 
     url: '@Url.Action("ShowCaptchaImage", "Login", new { random = Guid.NewGuid().ToString() })', 
      contentType: "image/png", 
      cache: false, 
      success: function (data) { 
       debugger; 
       alert(data); 

       var img = $('<img id="CaptchaImg" alt="" '); //Equivalent: $(document.createElement('img')) 
       img.attr('src', '@Url.Action("ShowCaptchaImage", "Login", new { random = Guid.NewGuid().ToString() })'); 
      //$("#test").html(''); 
      img.appendTo('#test'); 
     } 
     }); 
});

圖像不清爽。請幫忙。我使用OutputCache false並每次發送帶查詢字符串的唯一URL。但沒有成功。

來源

2014-01-06 Rohit Sethi

'ShowCatpchaImage'的結果是一個'image/jpeg'內容類型。不是文本，您不能將'img'標記的src'屬性設置爲二進制數據，它必須是圖像的URL。 – Snixtor

我使用以下代碼設置網址： img.attr（'src'，'@ Url.Action（「ShowCaptchaImage」，「Login」，new {random = Guid.NewGuid（）。ToString（）}）'） ; 請建議做些什麼。 –

實際上現在我看看它，'@ Url.Action'確實返回一個URL，或者應該。也許你的JavaScript沒有被剃刀引擎解析，所以'@ Url.Action'指令沒有被解析。你在做任何**調試嗎？刷新點擊處理程序正在執行？它是否發送請求？它發送請求的地址是什麼？您是否使用瀏覽器開發者工具？（F12） – Snixtor

//Put This one Partial view 
<img src="@Url.Action("GetCaptchaImage", "Vulpith_Public",new { [email protected]},Request.Url.Scheme)" /> 
<br /><input type="button" value="reload" onclick="Captcharefresh();" /> 



//And call ajax from this partial view as following 
function Captcharefresh() { 
    $.ajax({ 
       url: "../Vulpith_Public/_GetCaptcha", 
       type: "post", 
       dataType: "html", 
       data: {}, 
    success: function (data) { 
     $('#codeRefresh').html(data) 
    }, 
    error: function (data) { 
    } 
}); 
} 


//and create actions as following 

public FileResult GetCaptchaImage(DateTime dt) 
    { 
     CaptchaRandomImage CI = new CaptchaRandomImage(); 
     this.Session["CaptchaImageText"] = CI.GetRandomString(5); // here 5 means I want to get 5 char long captcha 
     //CI.GenerateImage(this.Session["CaptchaImageText"].ToString(), 300, 75); 
     // Or We can use another one for get custom color Captcha Image 
     CI.GenerateImage(this.Session["CaptchaImageText"].ToString(), 300, 75, Color.DarkGray, Color.White); 
     MemoryStream stream = new MemoryStream(); 
     CI.Image.Save(stream, ImageFormat.Png); 
     stream.Seek(0, SeekOrigin.Begin); 
     return new FileStreamResult(stream, "image/png"); 
    } 

//One more action as 
[HttpPost] 
    public ActionResult _GetCaptcha() 
    { 
     return PartialView(); 
    }

來源

2017-03-17 13:52:17

在MVC4自定義驗證碼圖片刷新

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