Question

这里的目标是使用BindingSource + Object作为DataSource和TextBox来显示对象的属性值。

我面临的问题是TextBox没有反映底层对象的属性值变化。

正如中国人所说，一张图片相当于千言万语，所以在演示代码下面就是我所面临的问题。

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Runtime.CompilerServices;


namespace TextBoxDataSourceBindingDemo
{


    public partial class Form1 : Form
    {
        private BindingSource dsSource;
        private BindingDemoClass bDemoClass;
        public Form1()
        {
            InitializeComponent();
            bDemoClass = new BindingDemoClass();
            dsSource = new BindingSource();

            bDemoClass.BindingName = "DemoBinding";
            this.textBox1.DataBindings.Add(new Binding("Text", dsSource, "BindingName",true,DataSourceUpdateMode.OnPropertyChanged));
        }

        private void btnAssignDataSource_Click(object sender, EventArgs e)
        {
           //Setting the datasource is not enough to 
           //update the related textbox
           //refresh must be explicity called ?
           dsSource.DataSource = bDemoClass;
           dsSource.ResetBindings(true);
        }

        private void btnChangePropertyValue_Click(object sender, EventArgs e)
        {
            //Here after setting the property value
            //the textbox should be update with the new value; correct ?
            bDemoClass.BindingName = "DemoBinding2";
        }
    }
    //Demo class used as datasource  
    public class BindingDemoClass : INotifyPropertyChanged
    {
        private string _BindingName = String.Empty;

        public string BindingName
        {
            get { return _BindingName; }
            set
            {
                if (!String.Equals(_BindingName, value))
                {
                    _BindingName = value;
                    NotifyPropertyChanged();
                }
            }
        }

        private void NotifyPropertyChanged([CallerMemberName] String propertyName = "")
        {
            if (PropertyChanged != null)
            {
                PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
            }
        }


        #region INotifyPropertyChanged Members

        public event PropertyChangedEventHandler PropertyChanged;

        #endregion
    }
}

因此，当单击btnAssignDataSource按钮时，文本框会更新。我希望当绑定属性更改（btnChangePropertyValue）时，更改将反映到文本框中。

Answer 1

你试过这个吗.textBox1.DataBindings.Add（“Text”，dsSource，“BindingName”）;

通过bindingsource将文本框绑定到对象属性而不刷新

1 个答案: