为字符串 C# 创建自定义事件
本文关键字:自定义 事件 创建 字符串 | 更新日期: 2023-09-27 17:56:41
>我有以下内容:
using System.Data;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Security.Permissions;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace FarmKeeper.Forms
{
public partial class FarmLogs : Form
{
static string errorLogText = "";
public string changedText = "";
public FarmLogs()
{
InitializeComponent();
string txtLoginLogPath = @"../../Data/LoginLog.txt";
StreamReader readLogins = new StreamReader(txtLoginLogPath);
txtLoginLog.Text = readLogins.ReadToEnd();
readLogins.Close();
loadLogs();
changedText = errorLogText;
txtErrorLog.Text = changedText;
}
public static void loadLogs()
{
string txtErrorLogPath = @"../../Data/MainErrorLog.txt";
StreamReader readErrors = new StreamReader(txtErrorLogPath);
errorLogText = readErrors.ReadToEnd();
readErrors.Close();
}
}
}
现在,我想做的是检查字符串 changedText,是否更改。我对自定义事件有所了解,但我无法弄清楚这一点,互联网上的事件也是如此。
如果更改文本已更改,则将另一个文本框设置为该字符串。
将字段替换为属性,并检查资源库中的值是否更改。如果它发生变化,请引发事件。有一个名为INotifyPropertyChanged
的属性更改通知接口:
public class Test : INotifyPropertyChanged
{
public event PropertyChangedEventHandler PropertyChanged;
private string myProperty;
public string MyProperty
{
get
{
return this.myProperty;
}
set
{
if (value != this.myProperty)
{
this.myProperty = value;
if (this.PropertyChanged != null)
{
this.PropertyChanged(this, new PropertyChangedEventArgs("MyProperty"));
}
}
}
}
}
只需将处理程序附加到 PropertyChanged
事件:
var test = new Test();
test.PropertyChanged += (sender, e) =>
{
// Put anything you want here, for example change your
// textbox content
Console.WriteLine("Property {0} changed", e.PropertyName);
};
// Changes the property value
test.MyProperty = "test";