Question

首先根据登录用户获取角色名称。之后根据角色从db获取功能代码。我需要将sql结果分配到Array，但它会显示错误can't convert from string to string[]

   public override string[] GetRolesForUser(string username)
    {
        DEV_Context OE = new DEV_Context();
        string role = OE.UserRefs.Where(x => x.UserName == username).FirstOrDefault().RoleName;

        string[] permission = OE.RolePermissionRefs.Where(x => x.RoleName == role).FirstOrDefault().FunctionCode; 
        string[] result={permission};

        return result;
    }

Answer 1

您需要字符串数组，因此请使用Select而不是ToArray方法，而不是使用FirstOrDefault。

您的方法应该是

public override string[] GetRolesForUser(string username)
{
    DEV_Context OE = new DEV_Context();
    string role = OE.UserRefs.Where(x => x.UserName == username).FirstOrDefault().RoleName;

    string[] result= OE.RolePermissionRefs.Where(x => x.RoleName == role).Select(x=>x.FunctionCode).ToArray(); 

    return result;
}

如何在c＃中为数组赋值

1 个答案: