DevExpress提示:无法将类型为"system.drawing.color"的对象强制转换为类型"system.string"

csdn_shb 2020-07-16 07:03:57
我数据库里写入的是字符串类型的#C0FFFF,给devexpress编写treelist绑定源后,在事件里加入
private void treeList1_CustomNodeCellEdit(object sender, GetCustomNodeCellEditEventArgs e)
{
if (e.Column.FieldName != "name")
{
object obj = e.Node.GetValue(0);
if (obj != null)
{
switch (e.Node.GetValue(0).ToString())
{
case "颜色":
e.RepositoryItem = colorEdit;
//e.RepositoryItem = colorPick;
break;

case "自动尺寸":
e.RepositoryItem = chkEdit;
break;
}
}
}
}

颜色下面的colorEdit已经是定义好的

结果运行后,更换颜色会提示:无法将类型为"system.drawing.color"的对象强制转换为类型"system.string"
不知怎么解决,何处下手,请大神帮下小弟。
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desperaso 2020-07-17
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转换string使用
ColorTranslator.ToHtml(...)
转回来用
ColorTranslator.FromHtml(...)
csdn_shb 2020-07-16
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colorEdit是控件的变量名,不能这样改的。
datafansbj 2020-07-16
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试试 e.RepositoryItem = "colorEdit";
Hobo丶 2020-07-16
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colorEdit 是控件类型,不能直接赋值的吧
DevExpress打印相关代码 using System; using System.Windows.Forms; using DevExpress.XtraPrinting; using System.Xml.Serialization; namespace MyDevExpressDemo { /// /// PrintSettingController 的摘要说明。 /// public class PrintSettingController { PrintingSystem ps = null; string formName=null; DevExpress.XtraPrinting.PrintableComponentLink link=null; /// /// /// /// 要打印的部件 /// 此部件对应的布局信息 public PrintSettingController(IPrintable control,string FormName) { formName=FormName; ps=new DevExpress.XtraPrinting.PrintingSystem(); link=new DevExpress.XtraPrinting.PrintableComponentLink(ps); ps.Links.Add(link); link.Component=control; ps.PageSettingsChanged-=new EventHandler(ps_PageSettingsChanged); LoadPageSetting(); ps.PageSettingsChanged+=new EventHandler(ps_PageSettingsChanged); ps.AfterMarginsChange+=new MarginsChangeEventHandler(ps_AfterMarginsChange); } public void Preview() { try { if(DevExpress.XtraPrinting.PrintHelper.IsPrintingAvailable) { Cursor.Current=Cursors.AppStarting; if(_PrintHeader!=null) { PageHeaderFooter phf = link.PageHeaderFooter as PageHeaderFooter; phf.Header.Content.Clear(); phf.Header.Content.AddRange(new string[] {"",_PrintHeader,""}); phf.Header.Font=new System.Drawing.Font("宋体",14,System.Drawing.FontStyle.Bold); phf.Header.LineAlignment=BrickAlignment.Center; } link.PaperKind=ps.PageSettings.PaperKind; link.Margins=ps.PageSettings.Margins; link.Landscape=ps.PageSettings.Landscape; link.CreateDocument(); ps.PreviewForm.Show(); } else { Cursor.Current=Cursors.Default; MessageBox.Show("打印机不可用", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information); } } finally { Cursor.Current=Cursors.Default; } } /// /// 打印控制器 /// /// 要打印的部件 public PrintSettingController(IPrintable control) { if(control==null)return; Control c=(Control)control; formName=c.FindForm().GetType().FullName+"."+c.Name; ps=new DevExpress.XtraPrinting.PrintingSystem(); link=new DevExpress.XtraPrinting.PrintableComponentLink(ps); ps.Links.Add(link); link.Component=control; ps.PageSettingsChanged-=new EventHandler(ps_PageSettingsChanged); LoadPageSetting(); ps.PageSettingsChanged+=new EventHandler(ps_PageSettingsChanged); ps.AfterMarginsChange+=new MarginsChangeEventHandler(ps_AfterMarginsChange); } public void ExportToHtml() { try { using(SaveFileDialog fd=new SaveFileDialog()) { fd.Title="导出HTML文件"; fd.RestoreDirectory=true; fd.Filter="HTML文件|*.htm"; fd.FilterIndex=1; if(fd.ShowDialog()==DialogResult.OK) { // if(obj is DevExpress.XtraGrid.GridControl) // { // ((DevExpress.XtraGrid.GridControl)obj).ExportToHtml(fd.FileName); // MessageBox.Show("文件导出成功","导出",MessageBoxButtons.OK,MessageBoxIcon.Information); // } // else if(obj is DevExpress.XtraTreeList.TreeList) // { link.CreateDocument(); ps.ExportToHtml(fd.FileName); MessageBox.Show("文件导出成功","导出",MessageBoxButtons.OK,MessageBoxIcon.Information); // } } } } finally { } } /// /// 网格分组时要导出,请使用这个, /// public void GridGroupToExcel() { DevExpress.XtraGrid.GridControl grid=this.link.Component as DevExpress.XtraGrid.GridControl; if(grid!=null) { using(SaveFileDialog fd=new SaveFileDialog()) { fd.Title="导出Excel文件"; fd.RestoreDirectory=true; fd.Filter="Excel文件|*.xls"; fd.FilterIndex=1; if(fd.ShowDialog()==DialogResult.OK) { grid.ExportToExcel(fd.FileName); MessageBox.Show("文件导出成功","导出",MessageBoxButtons.OK,MessageBoxIcon.Information); } } } } public void ExportToExcel() { try { using(SaveFileDialog fd=new SaveFileDialog()) { fd.Title="导出Excel文件"; fd.RestoreDirectory=true; fd.Filter="Excel文件|*.xls"; fd.FilterIndex=1; if(fd.ShowDialog()==DialogResult.OK) { // if(obj is DevExpress.XtraGrid.GridControl) // { // ((DevExpress.XtraGrid.GridControl)obj).ExportToExcel(fd.FileName); // MessageBox.Show("文件导出成功","导出",MessageBoxButtons.OK,MessageBoxIcon.Information); // } // else if(obj is DevExpress.XtraTreeList.TreeList) // { link.CreateDocument(); ps.ExportToXls(fd.FileName); MessageBox.Show("文件导出成功","导出",MessageBoxButtons.OK,MessageBoxIcon.Information); // } } } } finally { } } string _PrintHeader=null; /// /// 打印时的标题 /// public string PrintHeader { set { _PrintHeader=value; } } /// /// 进行打印 /// public void Print() { try { if(DevExpress.XtraPrinting.PrintHelper.IsPrintingAvailable) { if(_PrintHeader!=null) { PageHeaderFooter phf = link.PageHeaderFooter as PageHeaderFooter; phf.Header.Content.Clear(); phf.Header.Content.AddRange(new string[] {"",_PrintHeader,""}); phf.Header.Font=new System.Drawing.Font("宋体",14,System.Drawing.FontStyle.Bold); phf.Header.LineAlignment=BrickAlignment.Center; } link.PaperKind=ps.PageSettings.PaperKind; link.Margins=ps.PageSettings.Margins; link.Landscape=ps.PageSettings.Landscape; link.CreateDocument(); link.CreateDocument(); ps.Print(); } else { Cursor.Current=Cursors.Default; MessageBox.Show("打印机不可用", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information); } } finally { } } private void ps_AfterMarginsChange(object sender, MarginsChangeEventArgs e) { SavePageSetting(); } private void ps_PageSettingsChanged(object sender, EventArgs e) { SavePageSetting(); } //获取页面设置信息 void LoadPageSetting() { try { string path=System.Windows.Forms.Application.StartupPath+"\\PrintLayout"; if(!System.IO.Directory.Exists(path)) { return; } path+="\\"+formName+".xml"; if(!System.IO.File.Exists(path)) { return; } XmlSerializer ser=new XmlSerializer(typeof(UserPageSetting)); UserPageSetting setting=(UserPageSetting)ser.Deserialize(new System.IO.FileStream(path,System.IO.FileMode.Open,System.IO.FileAccess.Read,System.IO.FileShare.ReadWrite)); System.Drawing.Printing.Margins m=new System.Drawing.Printing.Margins(setting.Left,setting.Right,setting.Top,setting.Bottom); ps.PageSettings.Assign(m,(System.Drawing.Printing.PaperKind)setting.PaperKind,setting.Landscape); } catch{} } /// /// 保存当前网格的布局 /// void SavePageSetting() { try { string path=System.Windows.Forms.Application.StartupPath+"\\PrintLayout"; if(!System.IO.Directory.Exists(path)) { System.IO.Directory.CreateDirectory(path); } path+="\\"+formName+".xml"; DevExpress.XtraPrinting.XtraPageSettings setting= ps.PageSettings; UserPageSetting s=new UserPageSetting(); s.Landscape=setting.Landscape; s.Left=setting.Margins.Left; s.Right=setting.Margins.Right; s.Top=setting.Margins.Top; s.Bottom=setting.Margins.Bottom; s.PaperKind=(int)setting.PaperKind; XmlSerializer ser=new XmlSerializer(s.GetType()); ser.Serialize(new System.IO.FileStream(path,System.IO.FileMode.Create,System.IO.FileAccess.Write,System.IO.FileShare.ReadWrite),s); } catch{} } } /// /// 最终用户对某个打印页的设置 /// [Serializable()] public class UserPageSetting { public UserPageSetting() { } public bool Landscape; public int PaperKind; public int Top; public int Bottom; public int Left; public int Right; } }

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