小编Jun*_*ang的帖子

所以我在C#中有以下代码:

public Container ConfigureSimpleInjector(IAppBuilder app)
{
    var container = new Container();

    container.Options.DefaultScopedLifestyle = new AsyncScopedLifestyle();

    container.RegisterPackages();  

    app.Use(async (context, next) =>
    {
        using (AsyncScopedLifestyle.BeginScope(container))
        {
            await next();
        }
    });

    container.Verify();

    return container;
}

在app.Use()被定义为Owin.AppBuilderUserExtensions.Use(),看起来像这样:

public static IAppBuilder Use(this IAppBuilder app, Func<IOwinContext, Func<Task>, Task> handler);

VB等价如下:

Public Function ConfigureSimpleInjector(app As IAppBuilder) As Container
    Dim container = New Container()

    container.Options.DefaultScopedLifestyle = New AsyncScopedLifestyle()

    container.RegisterPackages()

    app.Use(Async Sub(context, [next])
                Using AsyncScopedLifestyle.BeginScope(container)
                    Await [next]()
                End Using
            End Sub)

    container.Verify()

    Return container
End …

所以我使用angular-2-local-storage将一个对象存储到本地存储中：

this.localStorage.set('myObject', {'prop1': "string", 'prop2': "string"});

然后我试图获取该对象的特定属性，如下所示：

this.localStorage.get('myObject').prop1;

但是这样做给了我错误 Property 'prop1' does not exist on type '{}'

我还尝试将对象存储在局部变量中，然后尝试访问该属性，但它给了我同样的错误。

var myObject = this.localStorage.get('myObject'); var myProperty = myObject.prop1;

我做错了什么，如何访问数据？

我正在尝试将以下C#代码转换为VB.NET.问题在于lambda表达式.

public class UserStore
{
    private readonly IDatabaseFactory _databaseFactory;

    private DataContext _db;
    protected DataContext Db => _db ?? (_db = _databaseFactory.GetDataContext());

    public UserStore(IDatabaseFactory databaseFactory)
    {
        _databaseFactory = databaseFactory;
    }
}

以下是我将代码转换为:

Public Class UserStore
    Private ReadOnly _databaseFactory As IDatabaseFactory

    Private _db As DataContext
    Protected Db As DataContext = Function() As DataContext
                                     If _db Is Nothing Then
                                         _db = _databaseFactory.GetDataContext()
                                     End If
                                     Return _db
                                  End Function

    Public Sub New(databaseFactory As IDatabaseFactory)
        _databaseFactory = databaseFactory
    End Sub
End Class

由于某种原因,转换后的lambda会给出错误 Lambda expression …

所以我正在调用一个API,它返回我的Angular文件,如下所示:

getFile(fileInformation) {
  const req = new HttpRequest('POST', 'filedownload', fileInformation, { reportProgress: true, responseType: "blob" });
  return this.http.request(req);
}

在API控制器中(我按照这个SO的最佳答案来说明这一步):

Public Function GetFile(fileInformation As FileDto) As HttpResponseMessage
    Dim filePath = Path.Combine(FileConstants.FilePath, fileInformation.FileType, fileInformation.FileName)
    Dim fileStream = New FileStream(filePath, FileMode.Open, FileAccess.Read)

    Dim result = new HttpResponseMessage(HttpStatusCode.OK)
    result.Content = New StreamContent(fileStream)
    result.Content.Headers.ContentType = new MediaTypeHeaderValue("application/octet-stream")

    Return result
End Function

此调用返回的结果是HttpResponse,而body是类型Blob.

HttpResponse: {
  blob: {
    size: 289940,
    type: "application/octet-stream"
  },
  headers: ...,
  status: 200,
  ...
}

现在,我如何在收到响应的Angular组件中触发此文件的下载？