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

问题描述

我有一个基本属性，存储一个类型为Fruit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");
}

所以我设置 this.Food 表单外，然后显示在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 它正确更新。如果我以编程方式修改界面如下：

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

this.textBox.Text =NewFruit，它不更新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 ，但仍然相同。

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

推荐答案

p>我推荐你实现INotifyPropertyChanged并将你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);

这将修复它。

请注意，默认的 DataSourceUpdateMode 是 OnValidation ，所以如果不指定 OnPropertyChanged ，模型对象将不会更新，直到您的验证发生。

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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