如果有在PropertyGrid中用下拉框的朋友有困难的,请参见下面。并希望高手提出意见, 说明:下面的代码是不能run的。这是直接copy了我的东西,想用的朋友,需要修一些地方. using System; using System.Text; using System.Reflection; using System.Collections; using System.ComponentModel; using System.Runtime.InteropServices; using System.Data; using System.Drawing; using System.Drawing.Design; namespace Com.WorkFlowEnginer.Entity { #region 对象下来列表控建[Role] //对象选择下拉列表转化 public class DropDownListRoleConverter : System.Drawing.Design.UITypeEditor { public override UITypeEditorEditStyle GetEditStyle(ITypeDescriptorContext context) { return System.Drawing.Design.UITypeEditorEditStyle.DropDown; } public override object EditValue(ITypeDescriptorContext context, IServiceProvider provider, object value) { System.Windows.Forms.Design.IWindowsFormsEditorService iws = (System.Windows.Forms.Design.IWindowsFormsEditorService)provider.GetService(typeof(System.Windows.Forms.Design.IWindowsFormsEditorService)); if(iws!=null) { DropDownListRoleControll dlc = new DropDownListRoleControll(iws); iws.DropDownControl(dlc); return dlc.SelectString; } return value; } } public class DropDownListRoleControll : System.Windows.Forms.ListBox { public DropDownListRoleControll(System.Windows.Forms.Design.IWindowsFormsEditorService iws) { //初始化下拉列表 此处需要修改 DataTable dt = Com.WorkFlowEnginer.RoleManager.GetRoleList(); if ( dt != null && dt.Rows.Count>0) { foreach(DataRow dr in dt.Rows) { Role role = new Role(); role.RoleGuid = dr["Guid"].ToString(); role.Name = dr["Name"].ToString(); this.Items.Add(role); } } this._iws = iws; this.Visible = true; this.Height =100; this.BorderStyle = System.Windows.Forms.BorderStyle.None; //添加事件 this.SelectedValueChanged +=new EventHandler(cb_SelectedValueChanged); } //此处可以修改 private Com.WorkFlowEnginer.Entity.Role select = null; public Com.WorkFlowEnginer.Entity.Role SelectString { get { return this.select; } } private System.Windows.Forms.Design.IWindowsFormsEditorService _iws; private void cb_SelectedValueChanged(object sender, EventArgs e) { if ( this.SelectedItem != null) { //此处需要修改 this.select = (Com.WorkFlowEnginer.Entity.Role)this.SelectedItem; this._iws.CloseDropDown(); } else System.Windows.Forms.MessageBox.Show("无对象可得","提示",System.Windows.Forms.MessageBoxButtons.OK,System.Windows.Forms.MessageBoxIcon.Error); } } #endregion public class Activity { [ CategoryAttribute("活动属性"), ReadOnlyAttribute(false), BrowsableAttribute(true), EditorAttribute(typeof(DropDownListRoleConverter),typeof(System.Drawing.Design.UITypeEditor)), DescriptionAttribute("流程中所需要的角色的名称."), showChinese("角色名称:") ] //此处需要修改 public Role Role { get { return role;} set { role = value;} }
} 
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