分隔第一个中间姓氏 C#

Question

目标：在用户输入姓名时解析姓名，并显示带有第一个中间名和姓氏的消息框。现在它只在你输入三个名字时才有效，如果你尝试两个它会崩溃，我确定这是我的数组的原因，但我不确定我错在哪里。超级新手，我自己学习，所以任何帮助将不胜感激！！

用户看到的 PS GUI 只是一个输入块，供他们将他们的名字输入一行，每个单词之间有间距。

 private void btnParseName_Click(object sender, System.EventArgs e)
    {
        string fullName = txtFullName.Text;
        fullName = fullName.Trim();

        string[] names = fullName.Split(' ');

        string firstName = "";
        string firstLetter = "";
        string otherFirstLetters = "";
        if (names[0].Length > 0)
        {
            firstName = names[0];
            firstLetter = firstName.Substring(0, 1).ToUpper();
            otherFirstLetters = firstName.Substring(1).ToLower();
        }

        string secondName = "";
        string secondFirstLetter = "";
        string secondOtherLetters = "";
        if (names[1].Length > 0)
         {
            secondName = names[1];
            secondFirstLetter = secondName.Substring(0, 1).ToUpper();
            secondOtherLetters = secondName.Substring(0).ToLower();
         }

        string thirdName = "";
        string thirdFirstLetter = "";
        string thirdOtherLetters = "";
        if (names[2].Length > 0)
        {

            thirdName = names[2];
            thirdFirstLetter = thirdName.Substring(0, 1).ToUpper();
            thirdOtherLetters = thirdName.Substring(0).ToLower();

        }

        MessageBox.Show(
                "First Name:         " + firstLetter + otherFirstLetters + "\n\n" +
                "Middle Name:        " + secondFirstLetter + secondOtherLetters + "\n\n" +
                "Last Name:          " + thirdFirstLetter + thirdOtherLetters);

Answer 1

这是如何做到这一点的工作示例：

public class FullName
{
    public  string FirstName { get; set; }
    public  string MiddleName { get; set; }
    public  string LastName { get; set; }

    public FullName()
    {

    }

    public FullName(string fullName)
    {
        var nameParts = fullName.Split(new [] {' '}, StringSplitOptions.RemoveEmptyEntries);

        if (nameParts == null)
        {
            return;
        }
        if (nameParts.Length > 0)
        {
            FirstName = nameParts[0];
        }
        if (nameParts.Length > 1)
        {
            MiddleName = nameParts[1];
        }
        if (nameParts.Length > 2)
        {
            LastName = nameParts[2];
        }
    }

    public override string ToString()
    {
        return $"{FirstName} {MiddleName} {LastName}".TrimEnd();
    }
}

使用示例：

class Program
{
    static void Main(string[] args)
    {
        var fullName = new FullName("first middle last");
        Console.WriteLine(fullName);
        Console.ReadLine();
    }
}

Answer 2

您需要检查并处理第二个名称是否为空。初始化字符串将防止崩溃，然后检查输入。

string secondName = "";    
string secondFirstLetter = ""; 
string secondOtherLetters = "";

if(names.Length > 2)
{
    secondName = names[1];
    secondFirstLetter = secondName.Substring(0, 1).ToUpper();
    secondOtherLetters = secondName.Substring(0).ToLower();
}

事实上，初始化所有变量或管理用户输入验证是值得的。