System.Reflection.AmbiguousMatchException: '找到了不明确的匹配.' [英] System.Reflection.AmbiguousMatchException: 'Ambiguous match found.'

问题描述

我正在尝试从方法 TableExists 获取 MethodInfo 以便我可以使用类型调用它.

I am trying to get the MethodInfo from a method TableExists<T> so I can call it with a type.

该方法在OrmLiteSchemaApi 类中声明.有 2 个重载:

The method is declared inside OrmLiteSchemaApi class. There are 2 overloads:

public static bool TableExists<T>(this IDbConnection dbConn)
{
  // code omitted
}

public static bool TableExists(this IDbConnection dbConn, string tableName, string schema = null)
{
  // code omitted
}

我正在尝试像这样获取 MethodInfo:

I am trying to get the MethodInfo like this:

var tableMethod = typeof(OrmLiteSchemaApi).GetMethod("TableExists");

但它产生异常:

System.Reflection.AmbiguousMatchException: '找到不明确的匹配.'

System.Reflection.AmbiguousMatchException: 'Ambiguous match found.'

我只能找到一个与此相关的旧问题，该问题建议将空对象数组作为参数传递，但这似乎不适用于 .net 核心.

I could only find an old question related to this that suggested to pass an empty object array as parameter but this doesn't seem to work for .net core.

我想我需要指定特定的重载，但我不确定具体如何.

I guess I need to specify the specific overload but I am not sure exactly how.

如何获取MethodInfo?

推荐答案

您可以使用 GetMethods(复数！)获取所有匹配方法的数组，然后查找具有 IsGenericMethod:

You can use GetMethods (plural!) to get an array of all matching methods, and then look for the one which has IsGenericMethod:

var tm = typeof(OrmLiteSchemaApi)
        .GetMethods()
        .Where(x => x.Name == "TableExists")
        .FirstOrDefault(x => x.IsGenericMethod);

我建议不要使用参数说明符，因为它会给你一个对象，如果有任何问题，你可以在调试时逐步完成.

I recommend this over using parameter specifiers, since it'll give you an object you can step through at debug time if there are ever any problems.

这篇关于System.Reflection.AmbiguousMatchException: '找到了不明确的匹配.'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！