从 VB 调用 C# dll

Question

我正在使用来自 VB 项目的 C# DLL，到目前为止我没有问题，但是在更新 DLL 版本后，我在调用函数时出现了一些编译错误，我不确定问题是来自可选参数还是输出参数。

简而言之，我的问题与this one相反。

这是 DLL 中函数定义的一个示例（如果我修复了这个，它会发生在其他函数调用中，它是一个 BIG dll）：

public static bool RequestCode(string countryCode, string phoneNumber, out string password, string method = "sms", string id = null, string language = null, string locale = null, string mcc = "204", string salt = "")
public static bool RequestCode(string countryCode, string phoneNumber, out string password, out string response, string method = "sms", string id = null, string language = null, string locale = null, string mcc = "204", string salt = "")
public static bool RequestCode(string countryCode, string phoneNumber, out string password, out string request, out string response, string method = "sms", string id = null, string language = null, string locale = null, string mcc = "204", string salt = "")

这是我从 VB 打来的电话（它们都抛出错误）：

result = ThatLibrary.ThatClass.RequestCode(country, telephone, pass, cc, method)

或者

result = ThatLibrary.ThatClass.RequestCode(country, telephone, pass, method)

或者

result = ThatLibrary.ThatClass.RequestCode(country, telephone, pass, method, Nothing, Nothing, Nothing, "204", "")

或者

result = ThatLibrary.ThatClass.RequestCode(countryCode:=pais, phoneNumber:=telefono, password:=password, method:=metodo, id:=Nothing, language:=Nothing, locale:=Nothing, mcc:="204", salt:="")

这是错误信息：

错误 3“RequestCode”不明确，因为在“ThatClass”类中存在多种具有此名称的成员。

在寻找解决方案几天后，我正在考虑将我的所有项目转移到 C#，但这是一项艰巨的任务，所以我希望有一个我错过的简单解决方案......

Answer 1

您必须命名所有参数，这种情况才能在 VB 中工作。 您的最后一个方法调用（命名所有参数）适用于以下测试：

C# dll：

namespace ClassLibrary1
{
    class ThatClass
    {
        public static string RequestCode(string countryCode, string phoneNumber, out string password, string method = "sms", string id = null, string language = null, string locale = null, string mcc = "204", string salt = "") { password = ""; return ""; }
        public static string RequestCode(string countryCode, string phoneNumber, out string password, out string response, string method = "sms", string id = null, string language = null, string locale = null, string mcc = "204", string salt = "") { password = "";  response = ""; return ""; }
        public static string RequestCode(string countryCode, string phoneNumber, out string password, out string request, out string response, string method = "sms", string id = null, string language = null, string locale = null, string mcc = "204", string salt = "") { password = ""; response = ""; request = ""; return ""; }
    }
}

VB 项目，引用 C# dll：

Class ThisClass
    Sub testing()
        Dim country As String = "USA"
        Dim telephone As String = "555-555-5555"
        Dim pass As String = ""
        Dim cc As String = ""
        Dim method As String = ""
        Dim test As String = ClassLibrary1.ThatClass.RequestCode(countryCode:=country, phoneNumber:=telephone, password:=pass, method:=method, id:=Nothing, language:=Nothing, locale:=Nothing, mcc:="204", salt:="")
    End Sub
End Class