C＃和ASP.NET會話轉換錯誤

我有一個ASP.NET Web窗體頁面，圖像控件綁定到動畫gif。如果我在Internet Explorer（而不是其他瀏覽器）中打開它並單擊該頁面上的一個按鈕（打開文件），即使打開並關閉文件，gif也會停止移動。在我刷新瀏覽器之前它不會再啓動。我試着用下面的代碼來解決這個問題：C＃和ASP.NET會話轉換錯誤

protected void lnkStart_Click(object sender, EventArgs e) // Link Button Click Event 
{ 
    imgRefresher.Enabled = 1 == 1; // setting Timer Control Enabled to 1 
    Session["TimerEnabled"] = imgRefresher.Enabled; // storing 1 in Session 
    Session["FileName"] = "myFile.exe"; 
} 

protected void imgRefresher_Tick(object sender, EventArgs e) // Timer Control Tick Event 
{ 
    if (((int)Session["TimerEnabled"]) == 1) // This line gives me an invalid cast error 
    { 
     Session["TimerEnabled"] = 0 == 1; 
     string fileName = Session["FileName"].ToString(); 

     // This part I stole off the internet and will actually open the file. 
     System.IO.FileInfo fileInfo = new System.IO.FileInfo(fileName); 
     if (fileInfo.Exists) 
     { 
      Response.Clear(); 
      Response.AddHeader("Content-Disposition", "attachment; filename=" + fileInfo.Name); 
      Response.AddHeader("Content-Length", fileInfo.Length.ToString()); 
      Response.ContentType = "application/octet-stream"; 
      Response.WriteFile(fileInfo.FullName); 
      Response.End(); 
     } 
    } 

    imgRefresher.Enabled = 0 == 1; 
}

行IF（（（字節）會議[ 「TimerEnabled」]^1）== 0）給了我一個無效的轉換錯誤。我試着把它轉換成一個整數，一個字節，一個char，一個float和一個double。目標是將Session [「TimerEnabled」]從1切換到0，以便下一次關閉定時器控制。

來源

2014-11-21 ostrichchasedwormaroundfield

imgRefresher .Enabled = 0 == 1; = Enablade值爲False ...不是整數 – 2014-11-21 07:29:44

是不是0與false相同？ – ostrichchasedwormaroundfield 2014-11-21 07:30:55

jap ..但是您不能將Bool投射到Int這種方式 – 2014-11-21 07:34:54

在你的情況下，最好使用bool類型。（你不能投布爾爲int這樣(int)myBool - >無效的轉換錯誤

如果你想我們可以投這樣一個整數：

int myInteger = (imgRefresher.Enabled) ? 1 : 0;

更改代碼到：

protected void lnkStart_Click(object sender, EventArgs e) // Link Button Click Event 
{ 
    imgRefresher.Enabled = true; // setting Timer Control Enabled to 1 
    Session["TimerEnabled"] = imgRefresher.Enabled; // storing 1 in Session 
    Session["FileName"] = "myFile.exe"; 
} 

protected void imgRefresher_Tick(object sender, EventArgs e) // Timer Control Tick Event 
{ 
    if (Session["TimerEnabled"]) // This line gives me an invalid cast error 
    { 
     Session["TimerEnabled"] = false; 
     string fileName = Session["FileName"].ToString(); 

     // This part I stole off the internet and will actually open the file. 
     System.IO.FileInfo fileInfo = new System.IO.FileInfo(fileName); 
     if (fileInfo.Exists) 
     { 
      Response.Clear(); 
      Response.AddHeader("Content-Disposition", "attachment; filename=" + fileInfo.Name); 
      Response.AddHeader("Content-Length", fileInfo.Length.ToString()); 
      Response.ContentType = "application/octet-stream"; 
      Response.WriteFile(fileInfo.FullName); 
      Response.End(); 
     } 
    } 
    imgRefresher.Enabled = false; 
}

來源

2014-11-21 07:41:22

C＃和ASP.NET會話轉換錯誤

回答

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