数据内容值更改时刷新文本框

本文关键字：刷新 文本 数据 | 更新日期: 2023-09-27 18:26:33

我有几个指南针属性，每侧一个，还有一个方向属性。我将方向绑定到一个组合框，并且在设置指南针点的方向设置器中有一个case语句。

我遇到的问题是UI没有刷新。如果我关闭表单并重新打开它，则数据已更改为正确的值，但UI不会动态更改。

我需要做什么？

数据内容值更改时刷新文本框

对于使用WPF的案例，您正在寻找INotifyPropertyChanged接口，该接口允许您向UI"发送"带有属性的消息。

主要是在一个名为ViewModelBase:的库中

public class ViewModelBase : INotifyPropertyChanged
{
    /// <summary>
    /// Raised when a property on this object has a new value
    /// </summary>
    public event PropertyChangedEventHandler PropertyChanged;
    /// <summary>
    /// Raises this ViewModels PropertyChanged event
    /// </summary>
    /// <param name="propertyName">Name of the property that has a new value</param>
    protected void SendPropertyChanged(string propertyName)
    {
        SendPropertyChanged(new PropertyChangedEventArgs(propertyName));
    }
    /// <summary>
    /// Raises this ViewModels PropertyChanged event
    /// </summary>
    /// <param name="e">Arguments detailing the change</param>
    protected virtual void SendPropertyChanged(PropertyChangedEventArgs e)
    {
        var handler = this.PropertyChanged;
        if (handler != null)
        {
            handler(this, e);
        }
    }
    public void SendPropertyChanged<TProperty>(Expression<Func<TProperty>> property)
    {
        var lambda = (LambdaExpression)property;
        MemberExpression memberExpression;
        if (lambda.Body is UnaryExpression)
        {
            var unaryExpression = (UnaryExpression)lambda.Body;
            memberExpression = (MemberExpression)unaryExpression.Operand;
        }
        else
        {
            memberExpression = (MemberExpression)lambda.Body;
        }
        SendPropertyChanged(memberExpression.Member.Name);
    }
    //.Net 4.5? or 4 and BCL included?
    /// <summary>
    /// Raises this ViewModels PropertyChanged event
    /// </summary>
    /// <param name="propertyName">Name of the property that has a new value</param>
    protected void SendPropertyChanged([CallerMemberName]string propertyName = "")
    {
        SendPropertyChanged(new PropertyChangedEventArgs(propertyName));
    }    
}

在Setter中写入SendPropertyChanged(() => Property)或SendPropertyChanged("Property")，UI将更新

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