在Javascript中创建二进制字符串并在C#中转换

Question

I have a file upload area in my JavaScript application. When i upload the file i use JS FileReader to get a binary string of the uploaded file. I then pass this to my C# WebApi and attempt to Write this to a file so that i can be stored on the server.

JS Code

let myFile = ev.target.files[0];
if(myFile.size > 0){
    let reader = new FileReader();
    var fileByteArray = [];
    reader.readAsArrayBuffer(myFile);
    reader.onloadend = (e) => {                     
        var buffer = <ArrayBuffer>reader.result;
        var uintArray = new Uint8Array(buffer);
        var binaryString = String.fromCharCode.apply(null, uintArray);

        let resourceModel = new Model({
            contentType: myFile.type,                            
            fileName: myFile.name,
            fileContent: binaryString
         });                   

    } 
}

C# Code:

if (!String.IsNullOrEmpty(model.fileContent))
{
    byte[] bytes = Encoding.UTF8.GetBytes(model.FileContent);
    File.WriteAllBytes(RESOURCES_SAVE_PATH, bytes);                
}

It all looks like it works, there are no errors thrown during execution. However, when you go to open the file, the file wont open as it doesnt recognise the contents.

Any ideas how i can get this working?

Answer 1

Thanks to @JeremyBenks for the idea of using a Base64 string instead. The relevant changes for my example are as follows:

JS

var binaryString = String.fromCharCode.apply(null, uintArray);

For this

var b64String = btoa(String.fromCharCode.apply(null,uintArray));

C#

byte[] bytes = Encoding.UTF8.GetBytes(model.FileContent);

For this

byte[] bytes = Convert.FromBase64String(model.FileContent);