c# - 如何使用 DictionaryModelBinder？

Question

ASP.NET 核心 2.2 DictionaryModelBinder

[HttpGet("{id}", Name = "GetValue")]
public async Task<IActionResult> GetValue(
[ModelBinder(BinderType=typeof(DictionaryModelBinder<string,string>))] 
    IDictionary<string, string> id)
{
     return Ok();
}

错误:

InvalidOperationException: Multiple constructors accepting all given argument types have been found in type 'Microsoft.AspNetCore.Mvc.ModelBinding.Binders.DictionaryModelBinder`2[System.String,System.String]'. There should only be one applicable constructor.

Answer 1

经过一些源代码分析，我找到了使用DictionaryModelBinder的方法。 .

[HttpGet("GetValue")]
public async Task<IActionResult> GetValue([FromQuery] IDictionary<string, string> id)
{
     return Ok();
}

请求应该是

api/GetValue?id.Key1=Value1&id.Key2=Value2&id.Key3=Value3

(或)

api/GetValue?id[Key1]=Value1&id[Key2]=Value2&id[Key3]=Value3

注意

• 无需明确使用 ModelBinderAttribute .这是默认添加的
• 我们需要添加 FromQueryAttribute对于参数