public override object EditValue(System.ComponentModel.ITypeDescriptorContext context, IServiceProvider provider, object value)
{
if (null != context && null != context.Instance && null != context.Container)
{
IElement element = context.Instance as IElement;
if (null != element)
{
if (element is IExpression || element is IVisibleExpression)
{
SourceField sf = GetSourceField(element);
string ep = null;
if (element is IExpression)
{
ep = ((IExpression)element).Expression;
}
else
{
ep = ((IVisibleExpression)element).VisibleExpression;
}
using (MES.Report.MESReportExpressionEditor expEditor = new MES.Report.MESReportExpressionEditor(ep))
{
expEditor.ControlName = element.Name;
if (expEditor.ShowDialog() == DialogResult.OK)
{
return(expEditor.ExpressionText);
}
}
}
}
}
return(base.EditValue(context, provider, value));
}
public override object ConvertFrom(ITypeDescriptorContext context, System.Globalization.CultureInfo culture, object value)
{
if (null == context || null == context.Instance)
{
try
{
return(Convert.ToString(value));
}
catch
{
return("");
}
}
string str = string.Empty;
str = Convert.ToString(value);
MES.Report.MESReportExpressionEditor expEditor = new MES.Report.MESReportExpressionEditor();
if (expEditor.CheckExpr(str))
{
//异常直接抛出，谈MessageBox会导致
//被执行两次
return(str);
}
else
{
throw new Exception("表达式非法");
}
}
private void FunctionAction()
{
using (MES.Report.MESReportExpressionEditor expEditor = new MES.Report.MESReportExpressionEditor(VisibleExpression))
{
expEditor.ControlName = Name;
if (expEditor.ShowDialog() == DialogResult.OK)
{
VisibleExpression = expEditor.ExpressionText;
NotifyDesignSurfaceChange();
}
}
}