C# 将字符串数据绑定到文本框
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Databinding a string to a textbox
提问by Kashif
I'm trying to bind a simple one-line string to a textbox's "text" property but it doesn't seem to be working. What am I doing wrong?
我试图将一个简单的单行字符串绑定到文本框的“文本”属性，但它似乎不起作用。我究竟做错了什么？
string loadedFilename;
textBoxFileName.DataBindings.Add("Current File", loadedFilename, "Text");
I just want to show the user which file they're currently working on using a textbox. I'm using a textbox so that they can copy this string in winforms. (A label won't do that)
我只想使用文本框向用户显示他们当前正在处理的文件。我正在使用文本框，以便他们可以在 winforms 中复制此字符串。（标签不会这样做）
I cannot use an object wrapper because this will cause a cascade of complications down the line in my code. There must be a simple way to do this.
我不能使用对象包装器，因为这会在我的代码中导致一连串的复杂性。必须有一个简单的方法来做到这一点。
采纳答案by Martin
Due to your latest remark about not encapsulating the loadedFilename, I would say: do not use databinding. Instead do it the old fashioned way like
由于您最近关于不封装loadedFilename 的评论，我会说：不要使用数据绑定。而是用老式的方式来做
textBoxFileName.Text = loadedFilename;
Depending on the flow, you can make it an internal propery in the form-code like so
根据流程，您可以像这样在表单代码中将其设为内部属性
internal string Filename {
get { return this.loadedFilename;}
set {
this.loadedFilename = value;
textBoxFileName.Text = value;
}
}
Or set it in the Form_Load event.
或者在 Form_Load 事件中设置它。
Works everytime.
每次都有效。
回答by KRichardson
I would take a look at this other question - Data binding for TextBox
我会看看另一个问题 - TextBox 的数据绑定
Joepro reccomended using INotifyPropertyChanged for your class and then binding the textbox.
Joepro 建议为您的类使用 INotifyPropertyChanged，然后绑定文本框。
回答by Tihomir Tashev
string loadedFilename;
textBoxFileName.DataBindings.Add("Text", loadedFilename, "");
回答by user2432827
class Form1:System.Windows.Form, INotifyPropertyChanged{
public event PropertyChangedEventHandler PropertyChanged;
private loadFileName;
public LoadFileName{
get{
return loadFileName;
}
set{
if(this.loadFileName == value ) return;
this.loadFileName = value;
NotifyPropertyChanged("LoadFileName");
}
}
public Form1(){
Initalize();
this.textbox1.DataBindings.Add("Text",this,"LoadFileName");
}
public NotifyPropertyChanged(string propertyName){
if (PropertyChanged != null)
{
PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
}
}
}
