Question

我通过Ajax将Base64字符串发布到我的Web Api控制器。代码

将字符串转换为图像的代码

public static Image Base64ToImage(string base64String)
{
    // Convert base 64 string to byte[]
    byte[] imageBytes = Convert.FromBase64String(base64String);
    // Convert byte[] to Image
    using (var ms = new MemoryStream(imageBytes, 0, imageBytes.Length))
    {
        Image image = Image.FromStream(ms, true);
        return image;
    }
}

控制器代码

public bool SaveImage(string ImgStr, string ImgName)
{
    Image image = SAWHelpers.Base64ToImage(ImgStr);
    String path = HttpContext.Current.Server.MapPath("~/ImageStorage"); //Path

    //Check if directory exist
    if (!System.IO.Directory.Exists(path))
    {
        System.IO.Directory.CreateDirectory(path); //Create directory if it doesn't exist
    }

    string imageName = ImgName + ".jpg";

    //set the image path
    string imgPath = Path.Combine(path, imageName);

    image.Save(imgPath, System.Drawing.Imaging.ImageFormat.Jpeg);

    return true;
}

这总是因通用GDI +错误而失败。我错过了什么？有没有更好的方法将特定字符串保存为文件夹中的图像？

Answer 1

在Base64字符串中您拥有图像的所有字节。您不需要创建Image对象。您需要的只是从Base64解码并将此字节保存为文件。

示例

public bool SaveImage(string ImgStr, string ImgName) { String path = HttpContext.Current.Server.MapPath("~/ImageStorage"); //Path //Check if directory exist if (!System.IO.Directory.Exists(path)) { System.IO.Directory.CreateDirectory(path); //Create directory if it doesn't exist } string imageName = ImgName + ".jpg"; //set the image path string imgPath = Path.Combine(path, imageName); byte[] imageBytes = Convert.FromBase64String(ImgStr); File.WriteAllBytes(imgPath, imageBytes); return true; }

Answer 2

在ASP网络核心中，您可以从IHostingEnvironment获取路径

public YourController(IHostingEnvironment env)
{
   _env = env;
}

方法，

public void SaveImage(string base64img, string outputImgFilename = "image.jpg")
{
   var folderPath = System.IO.Path.Combine(_env.ContentRootPath, "imgs");
   if (!System.IO.Directory.Exists(folderPath))
   {
      System.IO.Directory.CreateDirectory(folderPath);
   }
   System.IO.File.WriteAllBytes(Path.Combine(folderPath, outputImgFilename), Convert.FromBase64String(base64img));
}

使用C＃和Web Api将base64字符串作为图像保存到服务器上的文件夹中

2 个答案: