[英]C# convert image data to bytes array
我有一張src = "data:image/png;base64...."
。
我想將此圖像轉換為字節數組byte[]
。
我嘗試過這樣的事情:
string[] Base64 = ImageData.Split(new char[] { ',' });
byte[] imageBytes = System.Convert.FromBase64String(Base64[1].ToString());
我在這里做錯了什么?
C# 8 版本,不使用Regex
或MemoryStream
:
var base64Image = "data:image/png;base64,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";
var offset = base64Image.IndexOf(',') + 1;
var imageInBytes = Convert.FromBase64String(base64Image[offset..^0]);
我不知道為什么要將圖像作為字節數組,但請考慮一下 Memorystreams。 這個例子在 vb.net 中:
Private Function GetImageByteArray(im As Image) As Byte()
Try
Using st As System.IO.MemoryStream = New System.IO.MemoryStream
im.Save(st, Imaging.ImageFormat.Raw)
Return st.ToArray
End Using
Finally
GC.Collect()
End Try
End Function
private byte[] GetImageByteArray(Image im)
{
try
{
using(MemoryStream st = new MemoryStream())
{
im.save(st, ImageFormat.Raw);
return st.toarray();
}
}
finally
{
GC.Collect();
}
}
但是所描述的問題更像是將數據從字符串轉換為字節數組。
image im;
using memorystream st = new memorystream(Convert.FromBase64String(data.substring(data.firstindexof(',')))
{im = image.fromstream(st);}
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