如何在xamarin.android中将图像转换为base64? [英] how to convert an image into base64 in xamarin.android?

问题描述

我有这段代码，它在android studio中很好用，但在xamarin中却不行 bitmap.Compress()在xamarin中具有不同的参数，我很困惑如何在xamarin.android中将图像转换为base64或二进制?

I have this code, it works very well in android studio but not in xamarin bitmap.Compress() has different arguments in xamarin and i am confused how to convert image into base64 or binary in xamarin.android?

我在第三行看到一个错误:

I am receving an error in the 3rd line:

(bitmap.Compress()有一些无效的参数).

( bitmap.Compress() has some invalid arguments).

Bitmap bitmap = BitmapFactory.DecodeResource(Resources, Resource.Drawable.ace1);
ByteArrayOutputStream bao = new ByteArrayOutputStream();
bitmap.Compress(Bitmap.CompressFormat.Jpeg, 100,bao);
byte[] ba = bao.ToByteArray();
string bal = Base64.EncodeToString(ba, Base64.Default);

推荐答案

如果您查看

If you look at the documentation for Bitmap.Compress in Xamarin, you'll see that the last parameter is a Stream.

.NET中ByteArrayOutputStream的等效项是MemoryStream，因此您的代码应为:

The equivalent of ByteArrayOutputStream in .NET is MemoryStream, so your code would be:

Bitmap bitmap = BitmapFactory.DecodeResource(Resources, Resource.Drawable.ace1);
MemoryStream stream = new MemoryStream();
bitmap.Compress(Bitmap.CompressFormat.Jpeg, 100, stream);
byte[] ba = stream.ToArray();
string bal = Base64.EncodeToString(ba, Base64.Default);

(如果您愿意，也可以使用Convert.ToBase64String而不是Base64.EncodeToString.)

(You could use Convert.ToBase64String instead of Base64.EncodeToString if you wanted, too.)

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