清明节
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路上行人欲断魂
借问酒家何处有
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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);
}
在构造函数中,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Excelif (_displayRightClickExportExcel){item4 = this._ContextMenuStrip.Items.Add(GetLanguage("SYS001196", "导出EXCEL"));//导出EXCELitem4.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+1if (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:
(右键菜单效果)
(如图:多次复制行,新增多条数据)
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!此文只是演示效果而已!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!