语言-Ext联合-目标运行时不支持默认接口实现

Question

我试图在Language-Ext中使用Union类型，但收到错误：“目标运行时不支持默认接口实现”和“类型或命名空间名称'InconsistentFirstName‘找不到”

我的代码如下所示：

[Union]
public interface Inconsistency
{
    public Inconsistency InconsistentFirstName(string localValue, string contactCentreValue);
    public Inconsistency InconsistentSurname(string localValue, string contactCentreValue);

    public string GetFieldName(Inconsistency inconsistency)
        => inconsistency switch
        {
            InconsistentFirstName n => "Name",
            InconsistenctSurname s => "Surname",
            _ => ""
        };
}

Answer 1

需要将GetFieldName添加到单独的类文件中。有一个由代码自动生成的分部类，叫做InconsistencyCon，所以我想要实现的东西可以用下面的代码来实现：

[Union]
public abstract partial class Inconsistency
{
    public abstract Inconsistency InconsistentFirstName(string localValue, string remoteValue); 
    public abstract Inconsistency InconsistentSurname(string localValue, string remoteValue);
}

public static partial class InconsistencyCon
{
     public static string FieldName(this Inconsistency inconsistency) =>
         inconsistency switch
         {
             InconsistentFirstName n => "Name",
             InconsistentSurname s   => "Surname",
             _  => ""
         };

     public static string Test(Inconsistency inconsistency)
        {
            if (inconsistency is InconsistentFirstName n)
            {
                var a = n.LocalValue;
                var b = n.FieldName;
                // etc
            }
        }
}