我如何使用支持MVC6依赖注入自定义模型粘合剂 [英] How do I use custom model binder that supports dependency injection in MVC6

问题描述

我想使用MVC自定义模型粘结剂，我想从我的IoC容器解决。我遇到的问题是，我无法访问我的容器，而我加入MVC服务，因为我的容器尚未建成（我需要建立我的容器之前添加MVC）。感觉像鸡/鸡蛋的问题，我相信我缺少一个简单的解决方案。

例如：

  services.AddMvc（）AddMvcOptions（选项=＆GT;
{
     options.ModelBinders.Add（serviceProvider.Resolve＆所述; CustomModelBinder＆GT;（））;
}）;
 

我的自定义模型粘合剂是这样的：

 公共类CustomModelBinder：IModelBinder
{
    私人的IServiceProvider的ServiceProvider;    公共CustomModelBinder（的IServiceProvider的ServiceProvider）
    {
        this.serviceProvider =的ServiceProvider;
    }    公共任务＆LT; ModelBindingResult＆GT; BindModelAsync（ModelBindingContext的BindingContext）
    {
        VAR模型= serviceProvider.GetService（bindingContext.ModelType）;
        bindingContext.Model =模型;        VAR粘结剂=新GenericModelBinder（）;
        返回binder.BindModelAsync（BindingContext中）;
    }
}
 

解决方案

每这里的帖子： HTTPS ：//github.com/aspnet/Mvc/issues/4167

要直接回答你的问题，使用：

  bindingContext.OperationBindingContext.ActionContext.HttpContext.RequestServices
 

在一个侧面说明，你也可以选择使用的选项 [FromServices] 来解决它。

I am trying to use a custom model binder in MVC that I want resolved from my IoC container. The issue I am having is that I can't access my container while I am adding the MVC service, because my container isn't built yet (and I need to add MVC before building my container). Feels like a chicken/egg issue, and I am sure I am missing a simple solution.

Example:

services.AddMvc().AddMvcOptions(options =>
{
     options.ModelBinders.Add(serviceProvider.Resolve<CustomModelBinder>());
});

My custom model binder looks like this:

public class CustomModelBinder : IModelBinder
{
    private IServiceProvider serviceProvider;

    public CustomModelBinder(IServiceProvider serviceProvider)
    {
        this.serviceProvider = serviceProvider;
    }

    public Task<ModelBindingResult> BindModelAsync(ModelBindingContext bindingContext)
    {
        var model = serviceProvider.GetService(bindingContext.ModelType);
        bindingContext.Model = model;

        var binder = new GenericModelBinder();
        return binder.BindModelAsync(bindingContext);
    }
}

解决方案

Per the post here: https://github.com/aspnet/Mvc/issues/4167

To answer your question directly, use:

bindingContext.OperationBindingContext.ActionContext.HttpContext.RequestServices

On a side note, you also have the option of using [FromServices] to resolve it for you.

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