• .Net Core 迁移之坑一 《WebAPI Get请求参数传入输入带有[]不识别问题》


    在Framwork 体系下 WebAPI项目 会有很多默认特性,例如:Get查询竟然支持三种数组查询方式

    1.https://localhost:44390/api/values?status=1&status=2

    2.https://localhost:44390/api/values?status[]=1&status[]=2

    3.https://localhost:44390/api/values?status[0]=1&status[1]=2

    直到客户端同鞋找到我,才发现第二种在.net core webapi 默认竟然不支持

    于是google了好久加上询问大牛,才找到一个解决方案,就是通过 Conventions 解决

    using Microsoft.AspNetCore.Http;
    using Microsoft.AspNetCore.Mvc;
    using Microsoft.AspNetCore.Mvc.ApplicationModels;
    using Microsoft.AspNetCore.Mvc.Filters;
    using Microsoft.AspNetCore.Mvc.ModelBinding;
    using Microsoft.Extensions.Primitives;
    using System;
    using System.Globalization;
    using System.Linq;
    using System.Threading.Tasks;
    
    namespace WebApplication
    {
        public class ArraryHandleQueryConvention : IParameterModelConvention
        {
            public void Apply(ParameterModel parameter)
            {
                if (parameter.ParameterType.IsArray || parameter.Attributes.OfType<FromQueryAttribute>().Any())
                    parameter.Action.Filters.Add(new ArrayQueryStringAttribute(parameter.ParameterName));
            }
        }
        public class ArrayQueryStringValueProvider : QueryStringValueProvider
        {
            private readonly string _key;
            private readonly IQueryCollection _values;
    
            public ArrayQueryStringValueProvider(IQueryCollection values)
                : this(null, values)
            {
            }
    
            public ArrayQueryStringValueProvider(string key, IQueryCollection values)
                : base(BindingSource.Query, values, CultureInfo.InvariantCulture)
            {
                _key = key;
                _values = values;
            }
    
            public override ValueProviderResult GetValue(string key)
            {
                var result = base.GetValue(key + "[]");
    
                if (_key != null && _key != key)
                {
                    return result;
                }
                if (result != ValueProviderResult.None)
                {
                    var splitValues = new StringValues(result.Values.ToArray());
                    return new ValueProviderResult(splitValues, result.Culture);
                }
                return result;
            }
        }
    
        [AttributeUsage(AttributeTargets.Method | AttributeTargets.Class, Inherited = true, AllowMultiple = false)]
        public class ArrayQueryStringAttribute : Attribute, IResourceFilter
        {
            private readonly ArrayQueryStringValueProviderFactory _factory;
    
            public ArrayQueryStringAttribute(string key)
            {
                _factory = new ArrayQueryStringValueProviderFactory();
            }
    
            public void OnResourceExecuted(ResourceExecutedContext context)
            {
            }
    
            public void OnResourceExecuting(ResourceExecutingContext context)
            {
                context.ValueProviderFactories.Insert(0, _factory);
            }
        }
        public class ArrayQueryStringValueProviderFactory : IValueProviderFactory
        {
            private readonly string _key;
    
            public ArrayQueryStringValueProviderFactory() 
            {
            }
    
            public ArrayQueryStringValueProviderFactory(string key)
            {
                _key = key;
            }
    
            public Task CreateValueProviderAsync(ValueProviderFactoryContext context)
            {
                context.ValueProviders.Insert(0, new ArrayQueryStringValueProvider(_key, context.ActionContext.HttpContext.Request.Query));
                return Task.CompletedTask;
            }
        }
    }
    View Code

    StartUp 里面添加就行了如图

    说者无意听者有心,后来大牛找到我说其实还有第二种方式 就是 JQueryQueryStringValueProviderFactory

    1行代码就解决了有木有

    看下结果大功告成

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  • 原文地址:https://www.cnblogs.com/zhaozhengyan/p/aspnet-core-webapi-array-handle.html
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