c# - 二进制数组在asp.net中成像

Question

<分区>

Answer 1

假设你有一个字节数组:

byte[] imageBackground = new byte[] { 137,80,78,71,13,10,26,10,0,0,0,13,73,72,68,... };

你可以创建一个 Image :

using (var stream = new MemoryStream(imageBackground))
using (var image = Image.FromStream(stream))
{
    // do something with the image
}

或者如果您想在 ASP.NET 网络表单上显示它，请在 Image 内控件，您可以编写一个通用处理程序，将此图像流式传输到响应:

public class ImageHandler : IHttpHandler
{
    public bool IsReusable
    {
        get { return true; }
    }

    public void ProcessRequest(HttpContext context)
    {
        var response = context.Response;
        byte[] imageBackground = new byte[] { 137,80,78,71,13,10,26,10,0,0,0,13,73,72,68,... };
        response.OutputStream.Write(imageBackground, 0, imageBackground.Length);
        response.ContentType = "image/jpeg";
    }
}

然后将 Image 控件指向这个通用处理程序:

<asp:Image runat="server" ID="myimage" ImageUrl="~/imagehandler.ashx" />