获取参数字典的C#WebApi包含空条目错误

使用以下api方法：

[HttpPut]
[Route("Customers/{CustomerId}/Search", Name = "CustomerSearch")]
[ResponseType(typeof(SearchResults))]
public async Task<IHttpActionResult> Search([FromBody]SearchFilters filters, long? CustomerId = null)
{
    //This func searches for some subentity inside customers
}

---

有人能帮助解决这个问题吗？或者纠正我做错了什么？

可选参数应该用作模板的结尾，因为它们可以从url中排除

此外，通过对客户id使用路由约束，您将确保不会将关键字误认为客户id

参考：

//放置客户/10/搜索
[HttpPut]
[Route（“Customers/{CustomerId:long}/Search”，Name=“CustomerSearch”）]
[响应类型（类型（搜索结果））]
公共异步任务搜索（长CustomerId，[FromBody]SearchFilters，）{
//此函数搜索客户内部的某些子实体
}
//获取客户/搜索
//获取客户/搜索/关键字
[HttpGet]
[路由（“客户/Search/{keyword？}”，Name=“GetCustomerByKeyword”）]
公共异步任务SearchCustomers（字符串关键字=“”）{
//此函数根据客户名称中的关键字搜索客户
}

谢谢。在我的情况下，CustomerId应该是长的。它是否适用于nullable long？否，因为在可选参数之后不能有段。

[HttpGet]
[Route("Customers/Search/{keyword}", Name = "GetCustomersByKeyword")]
public async Task<IHttpActionResult> SearchCustomers(string keyword = "")
{
    //This func searches for customers based on the keyword in the customer name
}

//PUT Customers/10/Search
[HttpPut]
[Route("Customers/{CustomerId:long}/Search", Name = "CustomerSearch")]
[ResponseType(typeof(SearchResults))]
public async Task<IHttpActionResult> Search(long CustomerId, [FromBody]SearchFilters filters, ) {
    //This func searches for some subentity inside customers
}

//GET Customers/Search    
//GET Customers/Search/keyword
[HttpGet]
[Route("Customers/Search/{keyword?}", Name = "GetCustomersByKeyword")]
public async Task<IHttpActionResult> SearchCustomers(string keyword = "") {
    //This func searches for customers based on the keyword in the customer name
}