l SelectionChangeCommitted事件 在设定datasource和displaymember和valuemember时,以及手动改变combobox索引和值时都不触发该事件, 只是在界面选择combobox不同值时触发 2 SelectedIndexChanged事件 索引改变时触发 3 SelectedValueChanged事件 值改变时触发
设置DataSource, DisplayMember, ValueMember不同顺序触发SelectedIndexChanged事件和SelectedValueChanged事件的次数
顺序一:
this.comboBox1.DisplayMember = "userName"; (不触发)
this.comboBox1.ValueMember = "userAge"; (只触发SelectedValueChanged)
this.comboBox1.DataSource = dt; (都触发)
SelectedValueChanged触发两次(总是先触发)SelectedIndexChanged,触发一次 (设置DisplayMember属性时不触发两种事件)
顺序二:
this.comboBox1.ValueMember = "userAge";
this.comboBox1.DisplayMember = "userName";
this.comboBox1.DataSource = dt;
同上
顺序三:
this.comboBox1.DataSource = dt; (都触发)
this.comboBox1.DisplayMember = "userName";(都触发)
this.comboBox1.ValueMember = "userAge";(只触发SelectedValueChanged事件)
SelectedValueChanged触发三次(总是先触发)SelectedIndexChanged,触发两次 (设置DisplayMember属性时不触发两种事件)
顺序四:
this.comboBox1.DataSource = dt; (都触发)
this.comboBox1.ValueMember = "userAge";(都触发) 其中SelectedValueChanged触发两次
this.comboBox1.DisplayMember = "userName";(都触发)
SelectedValueChanged触发四次(总是先触发)SelectedIndexChanged,触发三次 (设置DisplayMember属性时不触发两种事件) |