/// <summary>
/// 替换字符串里的$函数$和%%变量，结果不带""
/// 表达式结果如果为null，则用string.Empty代替
/// </summary>
/// <param name="expression"></param>
/// <param name="entity"></param>
/// <returns></returns>
public static string ReplaceExpression(string expression, object entity)
{
try
{
Match m = s_regexExpression.Match(expression);
while (m.Success)
{
string ownExpression = m.Groups[1].Value;
object result = EntityScript.CalculateExpression(ownExpression, entity);
string replaceString = string.Empty;
if (result != null)
{
replaceString = result.ToString();
}
expression = expression.Replace(m.Groups[0].Value, replaceString);
m = s_regexExpression.Match(expression);
}
}
catch (Exception ex)
{
throw new ArgumentException("expression of " + expression + " format is invalid!", ex);
}
return(expression);
}
///// <summary>
///// 在显示当前位置数据前发生
///// </summary>
//public event EventHandler CurrentDisplaying;
/// <summary>
/// 显示当前位置实体类数据
/// </summary>
public virtual void DisplayCurrent()
{
foreach (IDataControl dc in this.DataControls)
{
// if in tab control, the data control may be invisible
//if (!dc.Visible)
// continue;
switch (dc.ControlType)
{
case DataControlType.Unbound:
break;
case DataControlType.Normal:
{
if (string.IsNullOrEmpty(dc.PropertyName))
{
continue;
}
if (this.CurrentItem == null)
{
dc.SelectedDataValue = null;
}
else
{
try
{
dc.SelectedDataValue = EntityScript.GetPropertyValue(this.CurrentItem, dc.Navigator, dc.PropertyName);
}
catch (Exception ex)
{
throw new ArgumentException(string.Format("DataControl of {0} is Invalid!", dc.Name), ex);
}
}
}
break;
case DataControlType.Expression:
if (string.IsNullOrEmpty(dc.PropertyName))
{
continue;
}
if (dc.PropertyName.Contains("%"))
{
dc.SelectedDataValue = EntityScript.CalculateExpression(dc.PropertyName, this.CurrentItem);
}
else
{
}
break;
default:
throw new ArgumentException(string.Format("DataControl of {0} is Invalid!", dc.Name));
}
}
}