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43 lines
1.4 KiB
43 lines
1.4 KiB
3 months ago
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using Microsoft.AspNetCore.Mvc;
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using Microsoft.AspNetCore.Mvc.ModelBinding;
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using System;
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using System.Linq;
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using System.Threading.Tasks;
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namespace Kean.Presentation.Rest
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{
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/// <summary>
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/// 指定参数仅来自文件上传
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/// </summary>
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[AttributeUsage(AttributeTargets.Parameter)]
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public class FromFileAttribute : ModelBinderAttribute
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{
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/// <summary>
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/// 初始化 Kean.Presentation.Rest.FromFileAttribute 类的新实例
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/// </summary>
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public FromFileAttribute() : base(typeof(ModelBinder)) { }
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/// <summary>
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/// 实体绑定器
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/// </summary>
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private class ModelBinder : IModelBinder
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{
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/*
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* 实现 Microsoft.AspNetCore.Mvc.ModelBinding.IModelBinder.BindModelAsync(ModelBindingContext bindingContext) 方法
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*/
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public Task BindModelAsync(ModelBindingContext bindingContext)
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{
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if (bindingContext == null)
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{
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throw new ArgumentNullException(nameof(bindingContext));
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}
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if (bindingContext.HttpContext.Request.HasFormContentType)
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{
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bindingContext.Result = ModelBindingResult.Success(bindingContext.HttpContext.Request.Form.Files?.FirstOrDefault(f => f.Name == bindingContext.FieldName));
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}
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return Task.CompletedTask;
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}
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}
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}
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}
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