如何在 UWP 中将 jpeg 数据转换为图像

Question

XDocument xdoc = XDocument.Parse(rr.Nodes[1].ToString(), LoadOptions.None);
xdoc.Declaration = new XDeclaration("1.0", "UTF - 8", "yes");


var q = from b in xdoc.Descendants("PictureNo")

        select b.Value;

foreach (string item in q.ToList())
    textBox2.Text = item;

if (textBox2.Text == String.Empty)
{

    Byte[] data2 = new Byte[0];
    data2 = (Byte[])(Convert.FromBase64String(textBox2.Text));
    string base64String1 = Convert.ToBase64String(data2, 0, data2.Length);
    image.Source = "data:image/jpeg;base64," + base64String1;

Answer 1

您可以使用以下方法将Base64字符串转换为BitmapImage，然后您可以将其设置为Image.Source。

public async Task<BitmapImage> Base64ToBitmapAsync(string source)
{
    var byteArray = Convert.FromBase64String(source);            
    BitmapImage bitmap = new BitmapImage();
    using (MemoryStream stream = new MemoryStream(byteArray))
    {
        await bitmap.SetSourceAsync(stream.AsRandomAccessStream());
    }
    return bitmap;
}

您首先从Base64 源创建一个字节数组，然后将其用作MemoryStream，作为BitmapImage 的源加载。

然后你只需这样做：

image.Source = await Base64ToBitmapAsync( Convert.FromBase64String(textBox2.Text) );