C# 自定义控件摘记

 

C# 自定义控件属性  

现有自定义控件，内有一textbox控件 TextBox1。控件有一属性 Value 定义为 [BrowsableAttribute(true)] [BindableAttribute(true)] public string Value { get{return TextBox1.Text;} set{TextBox1.Text =value;} } 将该控件的实例绑定到窗体的bind...展开

跟踪了 当bindingSource.Current发生变更时，自定义属性和控件的普通控件属性的区别：
自定义的属性：会触发2次BindingComplete事件 一次是BindingCompleteContext.ControlUpdate 控件把值更新到变更前的bindingSource行 
第二次是BindingCompleteContext.DataSourceUpdate，bindingSource的新行把数据给控件
普通控件属性：只触发后面一次

定义 DataBindings
https://www.daniweb.com/programming/software-development/threads/255512/binding-an-application-setting-to-a-control-property

class BindableToolStripMenuItem : ToolStripMenuItem,IBindableComponent
    {
        #region IBindableComponent Members
        private BindingContext bindingContext;
        private ControlBindingsCollection dataBindings;
        [Browsable(false)]
        public BindingContext BindingContext
        {
            get
            {
                if (bindingContext == null)
                {
                    bindingContext = new BindingContext();
                }
                return bindingContext;
            }
            set
            {
                bindingContext = value;
            }
        }
        [DesignerSerializationVisibility(DesignerSerializationVisibility.Content)]
        public ControlBindingsCollection DataBindings
        {
            get
            {
                if (dataBindings == null)
                {
                    dataBindings = new ControlBindingsCollection(this);
                }
                return dataBindings;
            }
        }
        #endregion
    }

 

PropertyChanged;

        /// <summary>
        /// 外部修改ResultId值可以通知邦定的控件，内部修改无法通知邦定的控件？？？？？？？
        /// </summary>
        [Description("属性:返回ID")]
        //[Bindable(true)]
        [BrowsableAttribute(true)]
        [System.ComponentModel.Bindable(true)] 
        public string ResultId
        {
            get
            {//InvokePropertyChanged("ResultId");
                return _ResultId;
                
            }
            set
            {
                _ResultId = value;
                InvokePropertyChanged("ResultId");
            }
        }

        public event PropertyChangedEventHandler PropertyChanged;
        private void InvokePropertyChanged(string propName)
        {
            if (PropertyChanged != null)
                PropertyChanged(this, new PropertyChangedEventArgs(propName));
        }

 https://documentation.devexpress.com/#WindowsForms/CustomDocument113956/baseclass

https://www.youtube.com/watch?v=U1eypjtM8JI