我如何使用支持MVC6依赖注入自定义模型粘合剂

我如何使用支持MVC6依赖注入自定义模型粘合剂

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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=>
{
     options.ModelBinders.Add(serviceProvider.Resolve&所述; CustomModelBinder>());
});

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< ModelBindingResult> 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:

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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08-05 07:03