我正在创建一个表单来保存"会议"中的信息。用户将填写关于title
、location
、startTime
、endTime
、notes
和date
的信息。我目前正在做的是"保存更改"按钮,它将:
- 清除所有文本框
- 将输入存储在数组中
- 在ListBox中仅显示
title
- 当在ListBox中单击标题时,如果用户希望进行更改,则存储在该数组元素中的信息将重新填充到相应的TextBoxes中
我已经完成了#1、#2和#3。如果能为#4提供任何帮助,我将不胜感激。我已经粘贴了下面的编码供您查看。
public partial class CalendarForm : Form
{
int currentIndex;
int arraySize = 0;
Meeting[] meetingArray = new Meeting[100];
public CalendarForm()
{
InitializeComponent();
}
private void saveChangesButton_Click(object sender, EventArgs e)
{
meetingArray[arraySize] = new Meeting();
meetingArray[arraySize].title = textBoxTitle.Text;
meetingArray[arraySize].location = textBoxLocation.Text;
meetingArray[arraySize].startTime = textBoxStartTime.Text;
meetingArray[arraySize].endTime = textBoxEndTime.Text;
meetingArray[arraySize].notes = notesTextBox.Text;
currentIndex = arraySize;
arraySize++;
meetingListBox.Enabled = true;
textBoxTitle.Text = "";
textBoxLocation.Text = "";
textBoxStartTime.Text = "";
textBoxEndTime.Text = "";
notesTextBox.Text = "";
*edit* added these two lines which now add the title to the listBox
meetingListBox.Items.Add(meetingArray[currentIndex].title);
Controls.Add(meetingListBox);
}
}
public class Meeting
{
public string title;
public string location;
public string startTime;
public string endTime;
public string notes;
};
这就是我重构类的方式:
public partial class CalendarForm : Form
{
private List<Meeting> Meetings { get; set; }
public CalendarForm()
{
InitializeComponent();
Meetings = new List<Meeting>();
}
private void saveChangesButton_Click(object sender, EventArgs e)
{
try
{
Meeting meeting = CreateMeeting();
Meetings.Add(meeting);
meetingListBox.Add(meeting);
}
catch
{
//Add proper error handling here
}
}
private Meeting CreateMeeting()
{
return new Meeting()
{
Title = textBoxTitle.Text,
Location = textBoxLocation.Text
StartTime = DateTime.Parse(textBoxStartTime.Text),
EndTime = DateTime.Parse(textBoxEndTime.Text),
Notes = notesTextBox.Text,
};
}
}
//As Matt Burland answered already:
private void meetingListBox_SelectedIndexChanged(object sender, EventArgs e)
{
Meeting meeting = meetingListBox.SelectedItem as Meeting;
if (meeting != null)
{
textBoxTitle.Text = meeting.Title;
//...etc for all your other text boxes.
}
}
public class Meeting
{
public string Title { get; set; }
public string Location { get; set; }
public DateTime StartTime { get; set; }
public DateTime EndTime { get; set; }
public string Notes { get; set; }
public override string ToString()
{
return Title;
}
}
我做了很多更改,尤其是从数组切换到列表<>。列表更加灵活,提供了更好的功能。除非您真的需要使用数组,否则我会远离它们,只是为了更好地防止逻辑错误索引越界类型问题。
此外,我个人认为日期应该以DateTime结构格式存储,但这也是一个偏好问题。请注意,在将输入(尤其是日期)分配到Meeting对象之前,谨慎的做法是对其进行消毒/验证。
Meeting对象现在具有属性,而不是公共字段。如果您想要更改某些内容的获取/设置方式,则首选属性。
希望这能有所帮助。
我真的建议你查找数据绑定并学习如何正确地完成这项工作,但如果你想要一个快速而肮脏的解决方案(尽管最终你会发现它需要做更多的工作),我会做这样的事情:
private void saveChangesButton_Click(object sender, EventArgs e)
{
Meeting m = new Meeting();
m.title = textBoxTitle.Text;
m.location = textBoxLocation.Text;
m.startTime = textBoxStartTime.Text;
m.endTime = textBoxEndTime.Text;
m.notes = notesTextBox.Text;
meetingArray[arraySize] = m;
currentIndex = arraySize;
arraySize++;
meetingListBox.Enabled = true;
textBoxTitle.Text = "";
textBoxLocation.Text = "";
textBoxStartTime.Text = "";
textBoxEndTime.Text = "";
notesTextBox.Text = "";
meetingListBox.Items.Add(m);
//Controls.Add(meetingListBox); // You don't need to keep adding the control every time!
}
现在,在您的Meeting
类中,我将覆盖ToString()
,只返回标题。默认情况下,ListBox
将只使用添加到其中的ToString()
方法。
为了帮助#4,您希望绑定SelectedIndexChanged
事件,然后使用SelectedItem
属性,将其强制转换回Meeting
对象(因为它将返回Object
),然后使用它来重新填充各种文本框。
类似于:
private void meetingListBox_SelectedIndexChanged(object sender, System.EventArgs e)
{
Meeting m = meetingListBox.SelectedItem as Meeting;
if (m != null)
{
textBoxTitle.Text = m.title;
//...etc for all your other text boxes.
}
}