如何在C＃中将值分配给数组

Question

First of all get the rolename based on the login user. After that get the functioncode from db based on the role. I need to assign the sql result into Array , but it keep show error 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

You need array of string, so instead of using FirstOrDefault, use Select and than ToArray method.

Your method should look like

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;
}