.NET Core自定义模型联编程序调用默认模型联编程序 [英] .NET Core Custom model binder call default model binder

问题描述

我正在尝试在.NET Core中实现一些中间件，该中间件将小数点后舍入到2个小数位.通过ComplexTypeModelBinder，所有其他映射都可以像当前一样工作.我曾尝试在我的绑定器或从其继承之前调用该绑定器，但最终导致模型在碰到控制器时只是为空.

I'm trying to implement some middleware in .NET Core that rounds decimals to 2 decimal places. All of the other mapping can work as it currently does via the ComplexTypeModelBinder. I've tried calling that binder before mine or inheriting from it, but it ends up with the model just being null when it hits the controller.

基本上，我所追求的功能与此处要求的相同:从自定义模型绑定程序调用默认模型绑定程序吗?，但适用于.NET Core.

Essentially I'm after the same functionality as asked here: Call Default Model Binder from a Custom Model Binder?, but for .NET core.

推荐答案

public class JqGridModelBinder : IModelBinder
{
    public Task BindModelAsync(ModelBindingContext bindingContext)
    {
        if (bindingContext == null)
        {
            throw new ArgumentNullException(nameof(bindingContext));
        }

        var request = bindingContext?.ActionContext?.HttpContext?.Request;

        var param = new JqGridParam
        {
            isSearch = bool.Parse(request.Query["_search"]),
            pageIndex = int.Parse(request.Query["page"]),
            pageSize = int.Parse(request.Query["rows"]),
            sortColumn = request.Query["sidx"].ToString(),
            sortOrder = request.Query["sord"].ToString(),
            id = request.Query["id"].ToString(),
            param = request.Query["oper"].ToString(),
            editOper = request.Query["edit"].ToString(),
            addOper = request.Query["add"].ToString(),
            delOper = request.Query["del"].ToString(),
            @where = JqGridFilter.Create(request.Query["filters"]),
            //operation = (OPERATION)System.Enum.Parse(typeof(OPERATION), request.Query["oper"]=="null" ? "none": request.Query["oper"].ToString())
        };
        bindingContext.Result = ModelBindingResult.Success(param);

        return Task.CompletedTask;
    }
}

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