Asp.net web api 将图像发布到asp.net API 2和angular 2
当我尝试将映像发布到ASP.Net API 2时,我得到了415(不支持的媒体类型) 此资源不支持请求实体的媒体类型“multipart/form data”。,“exceptionMessage”:“没有MediaTypeFormatter可用于从媒体类型为“multipart/form data”的内容中读取“Attachment”类型的对象 我的后端发布方法:Asp.net web api 将图像发布到asp.net API 2和angular 2,asp.net-web-api,angular,Asp.net Web Api,Angular,当我尝试将映像发布到ASP.Net API 2时,我得到了415(不支持的媒体类型) 此资源不支持请求实体的媒体类型“multipart/form data”。,“exceptionMessage”:“没有MediaTypeFormatter可用于从媒体类型为“multipart/form data”的内容中读取“Attachment”类型的对象 我的后端发布方法: [HttpPost] [Route("api/listing/{listingId}/Attachment/")]
[HttpPost]
[Route("api/listing/{listingId}/Attachment/")]
public async Task<dynamic> Post([FromBody] Attachment model)
{
var Attachments = new Attachment
{
ListingId = model.ListingId,
Content = model.Content,
Description = model.Description,
Name = model.Name,
MimeType = model.MimeType,
Size = model.Size,
CreatedOn = DateTime.UtcNow,
UpdatedOn = model.UpdatedOn,
};
return await DataStore.InsertDynamicAsync(Attachments);
}
[HttpPost]
[路由(“api/listing/{listingId}/Attachment/”)
公共异步任务发布([FromBody]附件模型)
{
var附件=新附件
{
ListingId=model.ListingId,
Content=model.Content,
Description=型号.Description,
Name=model.Name,
MimeType=model.MimeType,
尺寸=型号。尺寸,
CreatedOn=DateTime.UtcNow,
UpdatedOn=model.UpdatedOn,
};
return wait DataStore.InsertDynamicAsync(附件);
}
和我的前端方法:
onChangeImage(e: any) {
console.log(this.className + 'onChangeImage.event=' +JSON.stringify(event));
console.log(this.className + 'onChangeImage._listingAttachmentService undefined?: ' + (this._listingAttachmentService === undefined));
const inputElement = this.fileInput.nativeElement;
const fileList = inputElement.files;
const files = [];
console.log('AttachmentsTabComponent: file count = ' + fileList.length);
if (fileList.length > 0) {
for (let i = 0; i < fileList.length; i++) {
// get item
const file = fileList.item(i);
files.push(file);
const model: Attachment = {
listingId: this.listing.id,
mimeType: file.type,
name: file.name,
size: file.size,
updatedOn: file.lastModifiedDate
};
const reader = new FileReader();
reader.readAsDataURL(file);
console.log(this.className + 'onChangeImage.listingAttachmentService (before reader.onload) undefined?: ' + (this._listingAttachmentService === undefined));
reader.onload = (readerEvt: any) => {
const binaryString = readerEvt.target.result;
//base-64 encoded ASCII string
model.content = btoa(binaryString);
console.log(this.className + 'onChangeImage.listingAttachmentService (during reader.onload) undefined?: ' + (this._listingAttachmentService === undefined));
console.log(this.className + 'ListingAttachmentModel.content.length=' + JSON.stringify(model.content.length));
// this._listingAttachmentService.add(model);
};
}
// try to clear the file input
try {
// TODO: fix this
this.fileForm.nativeElement.reset();
inputElement.value = '';
if (inputElement.value) {
inputElement.type = 'text';
inputElement.type = 'file';
}
} catch (e) { }
this._listingAttachmentService.upload(this.listing.id, files)
.subscribe(data => {
this.listing.attachments = data;
});
}
}
onChangeImage(e:any){
log(this.className+'onChangeImage.event='+JSON.stringify(event));
log(this.className+'onChangeImage.\u listingAttachmentService未定义?:'+(this.\u listingAttachmentService==未定义));
const inputElement=this.fileInput.nativeElement;
const fileList=inputElement.files;
常量文件=[];
log('AttachmentsTabComponent:file count='+fileList.length);
如果(fileList.length>0){
for(设i=0;i{
const binaryString=readerEvt.target.result;
//base-64编码的ASCII字符串
model.content=btoa(二进制字符串);
console.log(this.className++'onChangeImage.listingAttachmentService(在reader.onload期间)未定义?:'+(this.u listingAttachmentService==未定义));
log(this.className+'ListingAttachmentModel.content.length='+JSON.stringify(model.content.length));
//此._listingAttachmentService.add(模型);
};
}
//尝试清除文件输入
试一试{
//TODO:解决这个问题
this.fileForm.nativeElement.reset();
inputElement.value='';
if(inputElement.value){
inputElement.type='text';
inputElement.type='文件';
}
}捕获(e){}
此.u listingAttachmentService.upload(this.listing.id,文件)
.订阅(数据=>{
this.listing.attachments=数据;
});
}
}
还有我的listingAttachmentService
upload(listingId: number, files: Array<File>) {
this._logger.debug('method upload() entered');
this._logger.debug('upload() listingId=' + listingId);
this._logger.debug('this.fileToUpload.length=' + files.length);
var self = this;
return Observable.create(observer => {
console.log('creating Observable');
let formData: FormData = new FormData(),
xhr: XMLHttpRequest = new XMLHttpRequest();
formData.append('listingId', listingId);
for (let i = 0; i < files.length; i++) {
formData.append('uploads[]', files[i], files[i].name);
}
xhr.onreadystatechange = () => {
if (xhr.readyState === 4) {
if (xhr.status === 200) {
observer.next(JSON.parse(xhr.response));
observer.complete();
} else {
observer.error(xhr.response);
}
}
};
let newbaseUrl = self.baseUrl + listingId + '/attachment/' ;
xhr.open('POST', newbaseUrl, true);
xhr.send(formData);
})
.catch(this.handleError);
}
上传(listingId:number,files:Array){
这是.u logger.debug('method upload()entered');
这是.u logger.debug('upload()listingId='+listingId);
this._logger.debug('this.fileToUpload.length='+files.length);
var self=这个;
返回可观察的。创建(观察者=>{
console.log(“创建可观察的”);
让formData:formData=new formData(),
xhr:XMLHttpRequest=新的XMLHttpRequest();
formData.append('listingId',listingId);
for(设i=0;i{
if(xhr.readyState==4){
如果(xhr.status==200){
next(JSON.parse(xhr.response));
observer.complete();
}否则{
观察者错误(xhr响应);
}
}
};
让newbaseUrl=self.baseUrl+listingId+'/attachment/';
xhr.open('POST',newbaseUrl,true);
xhr.send(formData);
})
.接住(这个.把手错误);
}
您应该使用自定义的MediaTypeFormatter。这里有更多信息:这里有一个示例
下面是一个帖子
POST http://localhost/api/FileUpload HTTP/1.1
Content-Type: multipart/form-data; boundary=-------------------------acebdf13572468
User-Agent: Fiddler
Content-Length: 88778
---------------------------acebdf13572468
Content-Type: application/json; charset=utf-8
Content-Disposition: form-data; name=attachment
{"ListingId":"testl"}
---------------------------acebdf13572468
Content-Disposition: form-data; name=image; filename=image.jpg
Content-Type: image/jpeg
Image content
---------------------------acebdf13572468--
希望这能有所帮助。您能检查我的答案吗?我检查了您的答案,但收到500个内部服务器错误,错误消息为“发生了错误”。,“exceptionMessage”:“对象引用未设置为对象的实例”stackTrace:“at OutdoorAccess.Api.Utilities.CustomFormatter.c.b_u3_0(HttpContent c)在C:\\Users\\keroles.hakem\\Documents\\mvp\\web api\\OutdoorAccess.api\\Utilities\\CustomFormatter.cs中:System.Linq.Enumerable.FirstOrDefault[TSource]的第36行\r\n(IEnumerable
1 source,Func
2谓词)在OutdoorAccess.api.Utilities.CustomFormatter.d\u 3.MoveNext()在C:\\Users\\keroles.hakem\\Documents\\mvp\\web api\\OutdoorAccess.api\\Utilities\\CustomFormatter.cs:line 35\r\n---End of stack trace from…}中,您的文章似乎没有内容类型:image/jpeg。您正在上载的图像的内容类型是什么?您可以对文章进行fiddler跟踪并在此处更新吗?我正在使用Observab请看一下onChangeImage()方法并在我的问题中上载。能否在xhr.setRequestHeader(“内容类型”,“图像/jpeg”);
之前添加xhr.send(formData);
private void ConfigureWebApi(HttpConfiguration config)
{
//other code here
config.Formatters.Add(new CustomFormatter());
}
POST http://localhost/api/FileUpload HTTP/1.1
Content-Type: multipart/form-data; boundary=-------------------------acebdf13572468
User-Agent: Fiddler
Content-Length: 88778
---------------------------acebdf13572468
Content-Type: application/json; charset=utf-8
Content-Disposition: form-data; name=attachment
{"ListingId":"testl"}
---------------------------acebdf13572468
Content-Disposition: form-data; name=image; filename=image.jpg
Content-Type: image/jpeg
Image content
---------------------------acebdf13572468--