在 C# 中将 base64 转换为图像
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Convert base64 to Image in c#
提问by mbharanidharan88
I am using MVC#. When i try To convert to base64 string to image, the image is not getting opened. I am getting base64 string from javascript and coverting that to image in controller. Here's my code.
我正在使用 MVC#。当我尝试将 base64 字符串转换为图像时，图像没有打开。我从javascript获取base64字符串并将其转换为控制器中的图像。这是我的代码。
var base64 = "data:image/png;base64,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...AgkKCA4CbBouoSAQIECBAgQIAAAQIECBAgkIaA4CaNOuoFAQIECBAgQIAAAQIECBAgkKCA4CbBouoSAQIECBAgQIAAAQIECBAgkIaA4CaNOuoFAQIECBAgQIAAAQIECBAgkKCA4CbBouoSAQIECBAgQIAAAQIECBAgkIaA4CaNOuoFAQIECBAgQIAAAQIECBAgkKCA4CbBouoSAQIECBAgQIAAAQIECBAgkIaA4CaNOuoFAQIECBAgQIAAAQIECBAgkKCA4CbBourS9wLLy8vhypUrob+/Pxw8eBALAQIECBAgQIAAAQIECBAonIDgpnAlS7vBY2Nj4e7du6GpqSkMDg4KXNIut94RIECAAAECBAgQIECAQBkBwY0hUjcC09PT4enTp9kMmdIxOzsbhoeHw/z8fOjp6QlDQ0Ohubk5XL16NbS3t4epqakwMjIS2trafvTavXv3ws2bN1e+Pjo6GmZmZkJLS8ua13R0dNSNh4YQIECAAAECBAgQIECAAAHBjTFQNwLj4+Ph2LFjq86y+XzZU29vb4ghzPHjx0NfX1/W/vj11V6LAc+FCxdCDHG6urqy82NANDk5GS5evPija+oGQ0MIECBAgAABAgQIECBAgMAnAcGNYVA3AqsFN4uLi9mSqbm5uZXlUzG4KQUypRkyMbj50ms3btzIlmCVjiNHjmTBzQ+vqRsMDSFAgAABAgQIECBAgAABAoIbY6CeBCYmJrKlUgMDAyvNiq/FmTJHjx4Nly9fDpcuXQp5gpvPZ9yUbr5a2FNPHtpCgAABAgQIECBAgAABAgTMuDEG6kqgtDlxbNTp06fD4cOHw7Vr17J9aU6dOhWWlpbCmTNnvnrGTdwDp7THTWnj49UCoLrC0BgCBAgQIECAAAECBAgQaHgBwU3DDwEABAgQIECAAAECBAgQIECAQL0KCG7qtTLaRYAAAQIECBAgQIAAAQIECDS8wP8AN7hUDozwDE4AAAAASUVORK5CYII=";
byte[] str = System.Text.Encoding.Unicode.GetBytes(base64);
var buffer = Convert.FromBase64String(Convert.ToBase64String(str));
var file = Server.MapPath("~/Content/images/err.png");
System.IO.File.WriteAllBytes(file, buffer);
Image img = new Image();
img.ImageUrl = Server.MapPath("~/Content/images/err.png");
采纳答案by mbharanidharan88
I copied that base64 string prompt window. I used ajax method for posting the base64 string from client and it works for me
我复制了那个 base64 字符串提示窗口。我使用 ajax 方法从客户端发布 base64 字符串，它对我有用
C#
C＃
[HttpPost]
public void Base64ToImage(string source)
{
string base64 = source.Substring(source.IndexOf(',') + 1);
base64 = base64.Trim('var picture = jqplotToImg($('#ChartContent'));
//prompt("", picture);
$.ajax({ type: 'POST',
url: '../Report/Base64ToImage',
async: false,
data: { source: picture },
success: function (data) {
//alert(data);
}
});
');
byte[] chartData = Convert.FromBase64String(base64);
}
AJAX Method
AJAX 方法
string source = "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAABG4...YII=";
string base64 = source.Substring(source.IndexOf(',') + 1);
byte[] data = Convert.FromBase64String(base64);
回答by SLaks
Your code is totally wrong.
你的代码是完全错误的。
You need to parse out the actual base64 data from that string, by removing everything before the first comma.
您需要通过删除第一个逗号之前的所有内容，从该字符串中解析出实际的 base64 数据。
You can then call Convert.FromBase64String()on that data.
然后您可以调用Convert.FromBase64String()该数据。
