Question

如果Id为1，我试图以这种格式0000001生成Ref编号。我有一个前缀F和00000将被ID覆盖在后面。 ID是autoIncrement

这是我的方法但它给F-1等等我想要F-0000001。

public class Function : BaseModel
{
    public Function()
    {
        Ref = Sequence;
    }

    [ForeignKey("Corporate")]
    public int CorporateId { get; set; }

    public virtual Corporate Corporate { get; set; }
    public DateTime StartDate { get; set; }
    public DateTime EndDate { get; set; }

    public string Title { get; set; }

    [ForeignKey("User")]
    public int UserId { get; set; }


    public virtual User User { get; set; }
    public bool Approved { get; set; } = false;
    public bool Completed { get; set; } = false;
    public DateTime DateCreated { get; set; } = DateTime.Now;
    public string Note { get; set; }
    public string ContactPerson { get; set; }
    public string ContactPersonPhone { get; set; }
    public string ContactPersonEmail { get; set; }
    public string Ref { get; set; }

    private string Sequence
    {
        get
        {
            var seq = "F" + "-" + Id;
            seq = seq.Replace(" ", "000000");
            return seq;
        }
    }

}

Answer 1

只需将String.Format与custom format string：

一起使用即可

String.Format("F-{0:0000000}", 1056)

返回：F-001056

0是零占位符Replaces the zero with the corresponding digit if one is present; otherwise, zero appears in the result string.

格式项（{0:...}）之外的文本按原样复制到字符串中。

该属性应如下所示：

private string Sequence { get{ return String.Format("F-{0:0000000}", Id);}}

或

private string Sequence => String.Format("F-{0:0000000}", Id);

Answer 2

尝试使用C＃的PadLeft函数：

private string Sequence
{
    get
    {
        return "F-" + Id.ToString().PadLeft(6,"0");
    }
}

Answer 3

使用Int32.ToString，在您的媒体资源中传递以下格式字符串，如下所示：

private string Sequence => "F-" + Id.ToString("D7");

更改＆＃34; D7＆＃34;表示要填充多少个零。

C＃实体生成顺序号

3 个答案: