[英]How to avoid needing a reference to Ninject on an injection target assembly when using contextual binding
[英]How can I retrieve the attribute and the properties when using Ninject contextual binding?
我有一個構造函數
[ReadFromFile(@"C:\SampleData\login.json")]
public AccountController(IReadRepository<LoginMockDataModel> repository, string filePath) : base(repository)
{
}
該屬性包含屬性“ FilePath”。
public string FilePath {get;set;}
我想在上述情況下檢索“ FilePath”的值,該值為“ C:\\ SampleData \\ login.json”。
是否可以使用Ninject的IContext檢索值?
這個想法是檢索屬性的值,然后按如下所示在綁定中使用它:
// FileReadRepo contains a constructor with the argument "filePath"
// which will need a string passed to it which I am trying to retrieve
// from the Attribute above
Bind(typeof(IReadRepository<>)).To(typeof(FileReadRepo<>))
.WhenMemberHas<ReadFromFileAttribute>()
.WithConstructorArgument("filePath", CheckAttributePath);
其中CheckAttributePath是委托:
private object CheckAttributePath(IContext arg)
{
throw new NotImplementedException();
}
我不確定如何獲取屬性的值。
通過IContext.Request.Target.Member
完成訪問AccountController
的構造函數。 所以這工作:
private static object CheckAttributePath(IContext context)
{
var attributes = context.Request.Target.Member
.GetCustomAttributes(typeof(ReadFromFileAttribute), false);
return ((ReadFromFileAttribute)attributes[0]).Path;
}
完整的測試代碼(使用xunit和FluentAssertions):
using System;
using Ninject;
using Ninject.Activation;
using Xunit;
using FluentAssertions;
public interface IReadRepository<T>
{
string FilePath { get; }
}
public class FileReadRepo<T> : IReadRepository<T>
{
private readonly string filePath;
public FileReadRepo(string filePath)
{
this.filePath = filePath;
}
public string FilePath { get { return this.filePath; } }
}
[AttributeUsage(AttributeTargets.Constructor, AllowMultiple = false, Inherited = false)]
public class ReadFromFileAttribute : Attribute
{
public readonly string Path;
public ReadFromFileAttribute(string path)
{
this.Path = path;
}
}
public class AccountController
{
public readonly IReadRepository<string> Repository;
[ReadFromFile(IntegrationTest.SampleFilePath)]
public AccountController(IReadRepository<string> repository)
{
this.Repository = repository;
}
}
public class IntegrationTest
{
public const string SampleFilePath = @"C:\SampleData\login.json";
[Fact]
public void Test()
{
var kernel = new StandardKernel();
kernel.Bind(typeof(IReadRepository<>)).To(typeof(FileReadRepo<>))
.WhenMemberHas<ReadFromFileAttribute>()
.WithConstructorArgument("filePath", CheckAttributePath);
kernel.Get<AccountController>().Repository.FilePath.Should().Be(SampleFilePath);
}
private static object CheckAttributePath(IContext context)
{
var attributes = context.Request.Target.Member.GetCustomAttributes(
typeof(ReadFromFileAttribute), false);
return ((ReadFromFileAttribute)attributes[0]).Path;
}
}
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