TextBox 的数据绑定 [英] Data binding for TextBox

问题描述

我有一个基本属性来存储一个 Fruit 类型的对象:

I have a basic property that stores an object of type Fruit:

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");
}

所以我在表单外设置了 this.Food 然后它显示在 UI 中.

So I set this.Food outside the form and then it shows up in the UI.

如果我修改this.Food，它会正确更新.如果我以编程方式修改 UI，例如:

If I modify this.Food, it updates correctly. If I modify the UI programmatically like:

this.textBox.Text = "NewFruit"，它不会更新 this.Food.

this.textBox.Text = "NewFruit", it doesn't update this.Food.

为什么会这样?我还为 Fruit.Name 实现了 INotifyPropertyChanged，但还是一样.

Why could this be? I also implemented INotifyPropertyChanged for Fruit.Name, but still the same.

推荐答案

我建议您实现 INotifyPropertyChanged 并将您的数据绑定代码更改为:

I Recommend you implement INotifyPropertyChanged and change your databinding code to this:

this.textBox.DataBindings.Add("Text",
                                this.Food,
                                "Name",
                                false,
                                DataSourceUpdateMode.OnPropertyChanged);

这就解决了.

注意默认的DataSourceUpdateMode是OnValidation，所以如果你不指定OnPropertyChanged，模型对象直到在您进行验证之后.

Note that the default DataSourceUpdateMode is OnValidation, so if you don't specify OnPropertyChanged, the model object won't be updated until after your validations have occurred.

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