将图像路径转换为base64字符串

Question

如何将图像转换为C＃中的base64字符串？

例如，我有图像C:/image/1.gif的路径，并且想要返回data:image/gif;base64,/9j/4AAQSkZJRgABAgEAYABgAAD..。

Answer 1

试试这个

using (Image image = Image.FromFile(Path)) 
{ 
    using (MemoryStream m = new MemoryStream()) 
    { 
     image.Save(m, image.RawFormat); 
     byte[] imageBytes = m.ToArray(); 

     // Convert byte[] to Base64 String 
     string base64String = Convert.ToBase64String(imageBytes); 
     return base64String; 
    } 
} 

Answer 2

获取图像的字节数组（byte[]）表示，然后使用Convert.ToBase64String()，st。像这样：

byte[] imageArray = System.IO.File.ReadAllBytes(@"image file path"); 
string base64ImageRepresentation = Convert.ToBase64String(imageArray); 

要将base4图像转换回一个System.Drawing.Image对象：

var img = Image.FromStream(new MemoryStream(Convert.FromBase64String(base64String))); 

Answer 3

你可以将其转换这样

string test = @"C:/image/1.gif"; 
    byte[] bytes = System.Text.ASCIIEncoding.ASCII.GetBytes(test); 
    string base64String = System.Convert.ToBase64String(bytes); 
    Console.WriteLine("Base 64 string: " + base64String); 

输出

QzovaW1hZ2UvMS5naWY= 

Answer 4

这是我写的这个目的类：

public class Base64Image 
{ 
    public static Base64Image Parse(string base64Content) 
    { 
     if (string.IsNullOrEmpty(base64Content)) 
     { 
      throw new ArgumentNullException(nameof(base64Content)); 
     } 

     int indexOfSemiColon = base64Content.IndexOf(";", StringComparison.OrdinalIgnoreCase); 

     string dataLabel = base64Content.Substring(0, indexOfSemiColon); 

     string contentType = dataLabel.Split(':').Last(); 

     var startIndex = base64Content.IndexOf("base64,", StringComparison.OrdinalIgnoreCase) + 7; 

     var fileContents = base64Content.Substring(startIndex); 

     var bytes = Convert.FromBase64String(fileContents); 

     return new Base64Image 
     { 
      ContentType = contentType, 
      FileContents = bytes 
     }; 
    } 

    public string ContentType { get; set; } 

    public byte[] FileContents { get; set; } 

    public override string ToString() 
    { 
     return $"data:{ContentType};base64,{Convert.ToBase64String(FileContents)}"; 
    } 
} 

var base64Img = new Base64Image { 
    FileContents = File.ReadAllBytes("Path to image"), 
    ContentType="image/png" 
}; 

string base64EncodedImg = base64Img.ToString(); 

Answer 5

您可以使用Server.Map路径给出相对路径，然后你可以使用base64转换创建图像，也可以直接添加base64字符串image src。

byte[] imageArray = System.IO.File.ReadAllBytes(Server.MapPath("~/Images/Upload_Image.png")); 

string base64ImageRepresentation = Convert.ToBase64String(imageArray); 

Answer 6

由于我们大多数人一样oneliners：

Convert.ToBase64String(File.ReadAllBytes(imageFilepath)); 

如果你需要它为Base64字节数组：

Encoding.ASCII.GetBytes(Convert.ToBase64String(File.ReadAllBytes(imageFilepath))); 

Answer 7

类似的东西

Function imgTo64(ByVal thePath As String) As String 
    Dim img As System.Drawing.Image = System.Drawing.Image.FromFile(thePath) 
    Dim m As IO.MemoryStream = New IO.MemoryStream() 

    img.Save(m, img.RawFormat) 
    Dim imageBytes As Byte() = m.ToArray 
    img.Dispose() 

    Dim str64 = Convert.ToBase64String(imageBytes) 
    Return str64 
End Function