DataControlField与Parameter扩展-技术开发专区

DataControlField与Parameter扩展

作者：ITPUB论坛编辑： nancy 2008-06-17 00:00

【IT168技术文档】

这里以自定义CalendarField列为例
看DataControlField的CloneField()方法,先创建对象,再复制属性

    protected internal DataControlField CloneField()
{
DataControlField newField = this.CreateField();
this.CopyProperties(newField);
return newField;
}

创建列对象

DataControlField提供了CopyProperties 方法,此工作一定要做

        protected override DataControlField CreateField()
{
return new CalendarField();
}

复制属性

DataControlField提供了CopyProperties 方法

首先要先定义你需要的属性,然后将属性复制给CloneField方法中创建的对象,在更改属性时要记得调用OnFieldChanged方法，通知DataControlField对象状态发生变化，触发FieldChanged事件

  Custom properties#region Custom properties
// *******************************************************************
// PROPERTY: DataField
// Indicates the field providing the date in view mode
        public virtual string DataField
{
get
{
object o = this.ViewState["DataField"];
if (o != null)
return (string) o;
return String.Empty;
}
set
{
ViewState["DataField"] = value;
OnFieldChanged();
}
}
// *******************************************************************
// PROPERTY: ReadOnly
// Indicates the field from which the text of the drop-down items is taken
        public virtual bool ReadOnly
{
get
{
object o = base.ViewState["ReadOnly"];
if (o != null)
return (bool) o;
return false;
}
set
{
base.ViewState["ReadOnly"] = value;
OnFieldChanged();
}
}
// *******************************************************************
// PROPERTY: DataFormatString
// Indicates the format string for the date 
        public virtual string DataFormatString
{
get
{
object o = this.ViewState["DataFormatString"];
if (o != null)
return (string)o;
return String.Empty;
}
set
{
ViewState["DataFormatString"] = value;
OnFieldChanged();
}
}
#endregion
// *******************************************************************
// METHOD: CopyProperties
//  
        protected override void CopyProperties(DataControlField newField)
{
((CalendarField)newField).DataField = this.DataField;
((CalendarField)newField).DataFormatString = this.DataFormatString;
((CalendarField)newField).ReadOnly = this.ReadOnly;
base.CopyProperties(newField);
}

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