是模型绑定可能不MVC？ [英] Is model binding possible without mvc?

问题描述

说我有一个词典＆LT;字符串，字符串＆GT; ，我想更新从词典中值的对象，就像模型MVC结合...如何你会做，如果没有MVC？

Say I have a Dictionary<string, string> and I want to update an object with the values from the dictionary, just like model binding in MVC... how would you do that without MVC?

推荐答案

您可以使用DefaultModelBinder来实现这一点，但你需要将System.Web.Mvc集引用到您的项目。这里有一个例子：

You could use the DefaultModelBinder to achieve this but you will need to reference the System.Web.Mvc assembly to your project. Here's an example:

using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Globalization;
using System.Linq;
using System.Web.Mvc;

public class MyViewModel
{
    [Required]
    public string Foo { get; set; }

    public Bar Bar { get; set; }
}

public class Bar
{
    public int Id { get; set; }
}


public class Program
{
    static void Main()
    {
        var dic = new Dictionary<string, object>
        {
            { "foo", "" }, // explicitly left empty to show a model error
            { "bar.id", "123" },
        };

        var modelState = new ModelStateDictionary();
        var model = new MyViewModel();
        if (!TryUpdateModel(model, dic, modelState))
        {
            var errors = modelState
                .Where(x => x.Value.Errors.Count > 0)
                .SelectMany(x => x.Value.Errors)
                .Select(x => x.ErrorMessage);
            Console.WriteLine(string.Join(Environment.NewLine, errors));
        }
        else
        {
            Console.WriteLine("the model was successfully bound");
            // you could use the model instance here, all the properties
            // will be bound from the dictionary
        }
    }

    public static bool TryUpdateModel<TModel>(TModel model, IDictionary<string, object> values, ModelStateDictionary modelState) where TModel : class
    {
        var binder = new DefaultModelBinder();
        var vp = new DictionaryValueProvider<object>(values, CultureInfo.CurrentCulture);
        var bindingContext = new ModelBindingContext
        {
            ModelMetadata = ModelMetadataProviders.Current.GetMetadataForType(() => model, typeof(TModel)),
            ModelState = modelState,
            PropertyFilter = propertyName => true,
            ValueProvider = vp
        };
        var ctx = new ControllerContext();
        binder.BindModel(ctx, bindingContext);
        return modelState.IsValid;
    }
}

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