使用字符串和增量 int 生成客户 ID

我同意约翰尼 5。基本上，每次需要时建立数字。根据您存储和检索数据的方式（即本地、数据库等），该方法会有很大差异。

以下是我总结的一些例子。

// a basic String concantenation
private static String creatEIDex1(int idNum = 0)
{
    return "LCE" + idNum + "-2005";
}

// something more flexible with optional parameters and default arguments
// utilizing a single StringBUilder object is more memory efficient
private static String creatEIDex2(StringBuilder builder = null,int idNum = 0)
{
    // initialize fields and objects
    if (builder == null)
    {
        builder = new StringBuilder();
    }
    else
    {
        builder.Clear();
    }

    String prefix = "LCE";
    String suffix = "-2005";

    // combine
    builder.Append(prefiX);
    builder.Append(idNum);
    builder.Append(suffiX);

    return builder.ToString();
}

public static void Main(String[] args)
{
    StringBuilder strb = new StringBuilder();
    String custID = "";

    // some sample,auto-incremenTing numbers
    // using example method 1
    for (int n = 10000; n < 10006; n++)
    {
        custID = creatEIDex1(n);
        Console.WriteLine(custID);
    }

    // output spacer
    Console.WriteLine();

    // using example method 2 without pasing a StringBuilder object
    for (int n = 10000; n < 10006; n++)
    {
        custID = creatEIDex2(null,n);
        Console.WriteLine(custID);
    }

    // output spacer
    Console.WriteLine();

    // using example method 2 while pasing a StringBuilder object
    for (int n = 10000; n < 10006; n++)
    {
        custID = creatEIDex2(strb,n);
        Console.WriteLine(custID);
    }

    Console.WriteLine("Press Enter key to exit");
    Console.ReadLine();
}

输出：

LCE10000-2005
LCE10001-2005
LCE10002-2005
LCE10003-2005
LCE10004-2005
LCE10005-2005

LCE10000-2005
LCE10001-2005
LCE10002-2005
LCE10003-2005
LCE10004-2005
LCE10005-2005

LCE10000-2005
LCE10001-2005
LCE10002-2005
LCE10003-2005
LCE10004-2005
LCE10005-2005
Press Enter key to exit