又是一年清明节至,细雨绵绵犹如泪光,树叶随风摆动....
转眼间,一年又过去了三分之一,疫情的严峻让不少企业就跟清明时节的树叶一样,摇摇欲坠。裁员的裁员,降薪的降薪,996的996~~说起来都是泪,以上种种竟然在本公司都能见到,然而你现在还能看到博主翘着二郎腿,在工位上信誓旦旦的敲着代码也是奇迹!哎,生活不易,且行且珍惜吧!
Talk is Cheap, Show me the code!
如上所说,虽环境如此严峻,但也不能生疏了咱吃饭的手艺。不禁让我感受到,对技术的追求,不仅仅靠的是兴趣,更重要的是坚持啊!
废话少说,前面几个环节,博主分享了对基础控件的封装和扩展(举了几个栗子,大家可以举一反三。或者公众号Call我,源码免费奉上。),后面和大家一起看看对容器控件的封装和扩展,本篇以常用的Dev中GridControl控件的封装和扩展。
对容器控件的封装和扩展,和其他控件一样。首先,新建一个自定义类,让其继承Dev的GridControl:
public class KzxGridControl : GridControl, IControl
其次,给需要扩展的属性用特性方式标识,便于在VS设计界面来控制。本篇以最常用的两个功能来进行解析——GridControl右键菜单之复制行和导出Excel.具体核心代码如下:
private bool _displayRightClickCopyMenu = true; private bool _displayRightClickExportExcel = true; /// <summary> /// 是否显示右键菜单的复制行 /// </summary> [Category("右键菜单"), Description("DisplayRightClickMenu,显示右键菜单的复制行按钮"), Browsable(true)] public bool DisplayRightClickMenu { get { return _displayRightClickCopyMenu; } set { _displayRightClickCopyMenu = value; } } /// <summary> /// 是否显示右键菜单的导出Excel /// </summary> [Category("右键菜单"), Description("DisplayRightExportExcel,显示右键菜单的导出Excel按钮"), Browsable(true)] public bool DisplayRightExportExcel { get { return _displayRightClickExportExcel; } set { _displayRightClickExportExcel = value; } }
编译后,返回设计界面,点击GridControl控件查看属性窗体会发现我们刚刚新增的扩展属性:
属性设置完毕后,接下来就是初始化绑定该菜单的功能事件。
/// <summary> /// 构造 /// </summary> public KzxGridControl() : base() { if (this.MainView == null) { this.gridView1 = new DevExpress.XtraGrid.Views.Grid.GridView(); ((System.ComponentModel.ISupportInitialize)(this.gridView1)).BeginInit(); ((System.ComponentModel.ISupportInitialize)(this)).BeginInit(); this.SuspendLayout(); this.gridView1.GridControl = this; this.gridView1.Name = "gridView1"; this.gridView1.VertScrollVisibility = ScrollVisibility.Always; this.gridView1.HorzScrollVisibility = ScrollVisibility.Always; this.MainView = this.gridView1; this.ViewCollection.AddRange(new DevExpress.XtraGrid.Views.Base.BaseView[] { this.gridView1}); ((System.ComponentModel.ISupportInitialize)(this.gridView1)).EndInit(); ((System.ComponentModel.ISupportInitialize)(this)).EndInit(); this.ResumeLayout(false); } this._KzxBandedGridView = new KzxBandedGridView(false, _bandedGridView, this); this.Load += new EventHandler(GridControl_Load); }
构造函数中,绑定load事件,用于触发菜单事件
private void GridControl_Load(object sender, EventArgs e) { ToolStripItem item3; ToolStripItem item4; if (this.ContextMenuStrip == null) { this.ContextMenuStrip = new ContextMenuStrip(); } this._ContextMenuStrip = this.ContextMenuStrip; _ContextMenuStrip.Opened += _ContextMenuStrip_Opened; //如果需要显示右键复制行 if (_displayRightClickCopyMenu) { item3 = this._ContextMenuStrip.Items.Add(GetLanguage("RMI000452", "复制行"));//复制行 item3.Name = "copyline"; item3.Click += new EventHandler(CopyLine); } //如果需要显示右键导出Excel if (_displayRightClickExportExcel) { item4 = this._ContextMenuStrip.Items.Add(GetLanguage("SYS001196", "导出EXCEL"));//导出EXCEL item4.Click += new EventHandler((s, ee) => { //TODO:导出Excel动作 }); } ...
导出方法比比皆是,因项目而异,多表头的,普通的。。就不献丑了(如有需要也可公众号call我,源码免费奉上)。此处我们拿复制行来举栗子,方法如下:
#region 复制行 public void CopyLine(object sender, EventArgs e) { StringBuilder sqlsb = new StringBuilder(); GridView gridview = this.MainView as GridView; DataTable dt = null; DataColumn[] columns = null; //BindingSource bs = null; DataRow row = null; DataRow rowtemp = null; //举例是拿DataTable做数据源,所以下面代码暂时屏蔽 //bs = (this.DataSource as BindingSource); if (this.DataSource != null) { if (gridview.FocusedRowHandle >= 0) { row = gridview.GetDataRow(gridview.FocusedRowHandle); dt = ((this.DataSource as DataTable).DefaultView as DataView).Table; if (dt.PrimaryKey != null) { columns = dt.PrimaryKey; } DataTable dttemp = dt.Clone(); rowtemp = dttemp.Rows.Add(row.ItemArray); foreach (DataColumn c in columns) { rowtemp[c.ColumnName] = Guid.NewGuid(); } //判断iOrder是否存在,存在则不复制,且取最大值+1 if (dt.Columns.Contains("iOrder")) { int maxIOrder = string.IsNullOrWhiteSpace(dt.Compute("max(iOrder)", "1=1").ToString()) ? 0 : Convert.ToInt32(dt.Compute("max(iOrder)", "1=1").ToString()); rowtemp["iOrder"] = maxIOrder + 1; } dt.ImportRow(rowtemp); //执行右键复制行委托 OnRowCopy?.Invoke(); } } else { KzxMessageBox.Show(sysClass.ssLoadMsgOrDefault("MSG002204", "数据源不能为空")); } } #endregion
private void CopyLineMenu() { //是否显示右键的复制行按钮 if (this._displayRightClickCopyMenu == true) { bool iscontain = false; ToolStripItem item3; if (this.ContextMenuStrip == null) { this.ContextMenuStrip = new ContextMenuStrip(); } this._ContextMenuStrip = this.ContextMenuStrip; for (int i = 0; i < this._ContextMenuStrip.Items.Count; i++) { if (this._ContextMenuStrip.Items[i].Name.Equals("copyline", StringComparison.OrdinalIgnoreCase) == true) { iscontain = true; break; } } if (iscontain == false) { item3 = this._ContextMenuStrip.Items.Add(GetLanguage("RMI000452", "复制行"));//复制行 item3.Name = "copyline"; item3.Click += new EventHandler(CopyLine); } } }
具体效果如下:
完成!不过注意,以上功能如果运用于实际项目,烦请做好控制,尤其复制行功能,初衷是一个很复杂的GridControl十几二十多列的,不想一列一列输入的,可以采用这种模式,复制行后改动下即可。注意最好是在编辑状态下显示此操作,否则不仅不会保存到数据库,还白费功夫!此本只是演示效果而已!本篇到此结束...
最后,由于后续所有重写/重绘控件都在同一个项目使用,而且Dev系统引用文件较多,压缩后源码文件仍然很大,如果有需要源码的朋友,可以微信公众号联系博主,源码可以免费赠予~!有疑问的也可以CALL我一起探讨。
最最后,感谢您的耐心陪伴!如果觉得本篇博文对您或者身边朋友有帮助的,麻烦点个关注!赠人玫瑰,手留余香,您的支持就是我写作最大的动力,感谢您的关注,期待和您一起探讨!再会!