c# - webclient 无法使用文件(正在被另一个进程使用..)

Question

好的...这段代码的一部分最有可能使我想要的文件变得繁忙，我需要释放资源，否则该文件不能被 webclient 或其他任何东西使用:

WebClient webClient = new WebClient(); 
string remote = "sample.jpg"; 
string px = Request.PhysicalApplicationPath.ToString(); 
if (File.Exists(px+"1.jpg") != true) 
{ 
    string local = px + "1.jpg"; 
    webClient.DownloadFile(remote, local); 
} 
else 
{ 
    string local = px + "2.jpg"; 
    webClient.DownloadFile(remote, local); 
} 
try
{
    byte A, R, G, B;
    Color pixelColor;
    Color pixelColor1;

    string rt = px + "1.jpg";
    string rt1 = px + "2.jpg";

    System.Drawing.Image a = System.Drawing.Image.FromFile(rt);
    Bitmap bitmapImage = new Bitmap(a);

    System.Drawing.Image a1 = System.Drawing.Image.FromFile(rt1);
    Bitmap bitmapImage1 = new Bitmap(a1);



    List<string> list = new List<string>();


    for (int y = 0; y < bitmapImage.Height; y++)
    {
        for (int x = 0; x < bitmapImage.Width; x++)
        {
            pixelColor = bitmapImage.GetPixel(x, y);
            pixelColor1 = bitmapImage1.GetPixel(x, y);

我收到这个错误。

Line 168: webClient.DownloadFile(remote, local);" [IOException: The process cannot access the file

Answer 1

问题是 webclient 仍然卡在你的文件上。

尝试处理 webclient 以释放其资源。

WebClient webClient = new WebClient(); 
string remote = "sample.jpg"; 
string px = Request.PhysicalApplicationPath.ToString(); 
if (File.Exists(px+"1.jpg") != true) 
{ 
    string local = px + "1.jpg"; 
    webClient.DownloadFile(remote, local); 
} 
else 
{ 
    string local = px + "2.jpg"; 
    webClient.DownloadFile(remote, local); 
} 
webClient.Dispose()