[英]Deserialize nested ICollection<BaseType> in Asp.Net Web API 2 controller
[英]Submitting multiple files to ASP.NET controller accepting an ICollection<IFormFile>
在我的 ASP.NET Core 后端,我有一個控制器函數,如下所示:
[HttpPost]
[Route("documents/upload")]
public async Task<IActionResult> UploadFile(ICollection<IFormFile> files)
{
...
}
在我的前端,我這樣調用函數:
var postSettings = {
method: 'POST',
credentials: 'include',
mode: 'cors'
}
uploadDocuments( files ) {
var data = new FormData();
data.append('files', files);
postSettings.body = data;
return fetch(endPoint + '/documents/upload', postSettings);
}
如果“files”是單個文件 - 不是包含一個文件的數組,而是單個 File 對象 - UploadFile
包含單個文件的ICollection<IFormFile>
調用UploadFile
。
如果“files”是一個文件列表,或者是一個 FileList 或者一個 File 對象數組, UploadFile
被調用時帶有一個空的ICollection<IFormFile>
。
如何以可以將文件解析為ICollection<IFormFile>
的方式提交文件列表?
uploadDocuments(endPoint, files) {
var postSettings = {
method: 'POST',
credentials: 'include',
mode: 'cors'
};
var data = new FormData();
if(files.length > 0) {
for(var x = 0; x < files.length; x++) {
// the name has to be 'files' so that .NET could properly bind it
data.append('files', files.item(x));
}
}
postSettings.body = data;
return fetch(endPoint + '/documents/upload', postSettings);
}
使用模型綁定和
IFormFile
接口上傳文件時,操作方法可以接受單個IFormFile
或代表多個文件的IEnumerable<IFormFile>
(或List<IFormFile>
)。 下面的示例循環遍歷一個或多個上傳的文件,將它們保存到本地文件系統,並返回上傳文件的總數和大小。
[HttpPost]
[Route("documents/upload")]
public async Task<IActionResult> Post(List<IFormFile> files)
{
long size = files.Sum(f => f.Length);
// full path to file in temp location
var filePath = Path.GetTempFileName();
foreach (var formFile in files)
{
if (formFile.Length > 0)
{
using (var stream = new FileStream(filePath, FileMode.Create))
{
await formFile.CopyToAsync(stream);
}
}
}
// process uploaded files
// Don't rely on or trust the FileName property without validation.
return Ok(new { count = files.Count, size, filePath});
}
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