Question

我要将类属性传递给函数，但需要检查NULL和特定长度。我试图从UserInfo类中调用函数CheckProperty，但给出错误::

“非静态字段，方法或属性UserInfo.CheckProperty（string，int）”
“字段初始化程序无法引用非静态字段，方法或属性UserInfo.UserAddr.get”

public class clsUserBookKeeping {

    public class UserInfo
    {
        public string UserId { get; set; }   
        public string UserName { get; set; } // length should not exceed 20 characters, if NULL pass "TBD"
        public string UserAddr { get; set; } // length should not exceed 120 characters, if NULL pass "TBD"
        public string UserContact { get; set; } // length should not exceed 20 characters, if NULL pass "TBD"
    }

    var output = getRecord (UserInfo.UserId, UserInfo.UserName, UserInfo.UserAddr, UserInfo.UserContact);

    private string CheckProperty(this string value, int maxLength)
    {
        if (string.IsNullOrEmpty(value))
        {
            return "TBD";
        }
        if (!string.IsNullOrEmpty(value) && value.Length > maxLength)
        {
            return value.Substring(0, maxLength);
        }
        return value;
    }
}

注意：公共类clsUserBookKeeping是类，它不在代码块中。

我试过这个::

public class UserInfo
{

    public string UserId { get; set; }   
    public string UserName { get; set; } // length should not exceed 20, if NULL pass "TBD"
    public string UserAddr { get; set; } // length should not exceed 120, if NULL pass "TBD"
    public string UserContact { get; set; } // length should not exceed 20, if NULL pass "TBD"

    string getAddress = CheckProperty(UserAddr,120);
 }

但是得到了错误。如何调用 CheckProperty 函数并将属性值传递给getRecord？

类的属性验证null和字符串长度

0 个答案: