C# TextBox 的数据绑定
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Data binding for TextBox
提问by Joan Venge
I have a basic property that stores an object of type Fruit:
我有一个存储 Fruit 类型对象的基本属性：
Fruit food;
public Fruit Food
{
get {return this.food;}
set
{
this.food= value;
this.RefreshDataBindings();
}
}
public void RefreshDataBindings()
{
this.textBox.DataBindings.Clear();
this.textBox.DataBindings.Add("Text", this.Food, "Name");
}
So I set this.Foodoutside the form and then it shows up in the UI.
所以我this.Food在表单之外设置，然后它显示在 UI 中。
If I modify this.Food, it updates correctly. If I modify the UI programmatically like:
如果我修改this.Food，它会正确更新。如果我以编程方式修改 UI，如：
this.textBox.Text = "NewFruit", it doesn't update this.Food.
this.textBox.Text = "NewFruit"，它不会更新 this.Food。
Why could this be? I also implemented INotifyPropertyChangedfor Fruit.Name, but still the same.
为什么会这样？我也INotifyPropertyChanged为 Fruit.Name实现了，但还是一样。
采纳答案by Joepro
I Recommend you implement INotifyPropertyChanged and change your databinding code to this:
我建议您实现 INotifyPropertyChanged 并将您的数据绑定代码更改为：
this.textBox.DataBindings.Add("Text",
this.Food,
"Name",
false,
DataSourceUpdateMode.OnPropertyChanged);
That'll fix it.
这样就可以解决了。
Note that the default DataSourceUpdateModeis OnValidation, so if you don't specify OnPropertyChanged, the model object won't be updated until after your validations have occurred.
请注意，默认DataSourceUpdateMode值为OnValidation，因此如果您未指定OnPropertyChanged，则模型对象将在您的验证发生后才会更新。
回答by Hasani Blackwell
You can't databind to a property and then explictly assign a value to the databound property.
您不能将数据绑定到属性，然后显式地为数据绑定属性分配一个值。
回答by Mickey Perlstein
You need a bindingsource object to act as an intermediary and assist in the binding. Then instead of updating the user interface, update the underlining model.
您需要一个 bindingsource 对象作为中介并协助绑定。然后不是更新用户界面，而是更新下划线模型。
var model = (Fruit) bindingSource1.DataSource;
model.FruitType = "oranges";
bindingSource.ResetBindings();
Read up on BindingSource and simple data binding for Windows Forms.
阅读 BindingSource 和Windows Forms 的简单数据绑定。
回答by user3838082
We can use following code
我们可以使用以下代码
textBox1.DataBindings.Add("Text", model, "Name", false, DataSourceUpdateMode.OnPropertyChanged);
Where
在哪里
"Text"– the property of textboxmodel– the model object enter code here"Name"– the value of model which to bind the textbox.
"Text"– 文本框的属性model– 模型对象在此处输入代码"Name"– 绑定文本框的模型值。
