Web应用程序2中的DefaultInlineConstraintResolver错误 [英] DefaultInlineConstraintResolver Error in WebAPI 2

问题描述

我正在使用Web API 2，当我使用本地方框上的IIS 7.5向我的API方法发送POST时，我收到以下错误。

I'm using Web API 2 and I'm getting the following error when I send a POST to my API method using IIS 7.5 on my local box.

The inline constraint resolver of type 'DefaultInlineConstraintResolver' was unable to resolve the following inline constraint: 'string'.

Line 21: GlobalConfiguration.Configuration.EnsureInitialized();

我的API都没有使用IIS。但是，我能够使用IIS Express在Visual Studio中运行我的API项目并成功对我的登录API进行POST，但是当我尝试向另一个API调用发出GET请求时，我得到约束解析器错误。

None of my APIs work using IIS. However, I'm able to run my API project in Visual Studio using IIS Express and successfully make a POST to my login API, but when I try and make a GET request to another API call, I get the constraint resolver error.

为了解决这个问题，我在Visual Studio中创建了一个全新的Web API 2项目，并开始一次一个地将现有API导入到新项目中并运行它们以确保他们工作。在这个新项目中使用IIS Express，我得到的结果与我现有的API项目完全相同。

In order to troubleshoot this, I created a brand new Web API 2 project in Visual Studio and started importing the existing APIs into the new project one at a time and running them to ensure they work. Using IIS Express with this new project, I get the same exact results as I did with my existing API project.

我在这里缺少什么？即使有一个全新的项目，我也无法在不遇到此约束解析器问题的情况下发出GET请求。

What am I missing here? Even with a brand new project I'm not able to make GET requests without running into this constraint resolver issue.

推荐答案

错误意味着路线中的某个地方，你指定了类似

The error means that somewhere in a Route, you specified something like

[Route("SomeRoute/{someparameter:string}")]

不需要string，因为如果没有指定其他内容，它是假定的类型。

"string" is not needed as it is the assumed type if nothing else is specified.

如错误所示，Web API附带的 DefaultInlineConstraintResolver 没有名为字符串的内联约束。默认支持的是：

As the error indicates, the DefaultInlineConstraintResolver that Web API ships with does not have an inline constraint called string. The default supported ones are the following:

// Type-specific constraints
{ "bool", typeof(BoolRouteConstraint) },
{ "datetime", typeof(DateTimeRouteConstraint) },
{ "decimal", typeof(DecimalRouteConstraint) },
{ "double", typeof(DoubleRouteConstraint) },
{ "float", typeof(FloatRouteConstraint) },
{ "guid", typeof(GuidRouteConstraint) },
{ "int", typeof(IntRouteConstraint) },
{ "long", typeof(LongRouteConstraint) },

// Length constraints
{ "minlength", typeof(MinLengthRouteConstraint) },
{ "maxlength", typeof(MaxLengthRouteConstraint) },
{ "length", typeof(LengthRouteConstraint) },

// Min/Max value constraints
{ "min", typeof(MinRouteConstraint) },
{ "max", typeof(MaxRouteConstraint) },
{ "range", typeof(RangeRouteConstraint) },

// Regex-based constraints
{ "alpha", typeof(AlphaRouteConstraint) },
{ "regex", typeof(RegexRouteConstraint) }

这篇关于Web应用程序2中的DefaultInlineConstraintResolver错误的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！