实现WebForm下面的自动收集对象属性(与MVC下在的UpdateFrom一样)
23:15:57 对ASP.net MVC有了解的同学估计都对里面的UpdateFrom方法有较深的印象。它接受一个对象参数，然后，它会对任何匹配该对象的公开属性，自动对本身进行属性赋值。这样的功能都引来一片叫好声。可惜的是他只能在MVC下使用。那么在WebForm下面就不能实现这样的功能了吗？答案是可以的，其实还可以做得更好。这里把以前的代码翻出来晒晒。
我们还是先看一下UpdateFrom的实现。其实实现很简单，就是先用反射取得对象的所有的属性。然后在Requet.QuerySting或Requet.Form中查找对应的键。如果 找到了对应的值就再调用Property.SetValue方法对其设置属性值。代码如下
UpdateFrom
下面进入正题。看看在Webform
下面的实现，思路还是一样的。先把我的实现代码贴上来再说
/// <summary>
/// 根据对象自动给相应控件取值或者赋值
/// </summary>
public
class
ValuePicker
{
/// <summary>
/// 把对象赋值给相应控件
/// </summary>
/// <param name="dataEntity">对象</param>
/// <param name="page">要搜索控件的Page或者Master里的ContentPlaceHolder</param>
/// <returns></returns>
public int SetValue(object dataEntity, Control page)
{
return OperateValue(dataEntity, page, true);
}
/// <summary>
/// 把相应控件的属性值赋给对象的相应属性
/// </summary>
/// <param name="dataEntity">对象</param>
/// <param name="page">要搜索控件的Page或者Master里的ContentPlaceHolder</param>
/// <returns></returns>
public int GetValue(object dataEntity, Control page)
{
return OperateValue(dataEntity, page, false);
}
/// <summary>
/// 根据每个控件的类型，获取对应操作的属性名称
/// </summary>
/// <param name="typeName">控件类型</param>
/// <returns></returns>
private string GetPropertyTypeName(string typeName)
{
switch (typeName)
{
case "TextBox":
return "Text";
case "DropDownList":
return "SelectedValue";
case "CheckBox":
return "Checked";
case "HiddenField":
return "Value";
default:
return "Text";
}
}
/// <summary>
/// 具体实现赋值和取值的方法
/// </summary>
/// <param name="dataEntity">对象</param>
/// <param name="page">要搜索控件的Page或者Master里的ContentPlaceHolder</param>
/// <param name="isSetting">是否是要设置控件的值</param>
/// <returns></returns>
private int OperateValue(object dataEntity, Control page, bool isSetting)
{
try
{
Type EntityType = dataEntity.GetType();
Type ControlType;
//取得所有的属性
PropertyInfo[] Pinfos = EntityType.GetProperties(); ;
Control Ctrl;
Object Data = null;
string PropertyTypeName;
//遍历所有的属性
foreach (PropertyInfo Pinfo in Pinfos)
{
//查找属性对应的控件
Ctrl = page.FindControl(Pinfo.Name);
if (Ctrl != null)
{
ControlType = Ctrl.GetType();
//取得控件存储值的属性
PropertyTypeName = GetPropertyTypeName(ControlType.Name);
if (isSetting == true)
{//把对象的值设置给控件
Data = EntityType.InvokeMember(Pinfo.Name,
BindingFlags.GetProperty, null, dataEntity, null);
Data = ReDefineData(ControlType,Data, PropertyTypeName);
object[] SettingData ={ Data };
ControlType.InvokeMember(PropertyTypeName,
BindingFlags.SetProperty, null, Ctrl, SettingData);
}
else
{//取得控件的值赋给对象对应的属性
Data = ControlType.InvokeMember(PropertyTypeName,
BindingFlags.GetProperty, null, Ctrl, null);
Data = ReDefineData(EntityType, Data, Pinfo.Name);
object[] SettingData ={ Data };
EntityType.InvokeMember(Pinfo.Name,
BindingFlags.SetProperty, null, dataEntity, SettingData);
}
}
}
return 0;
}
catch (System.Exception E)
{
System.Diagnostics.Debug.WriteLine(E.ToString());
//注意
throw (E);
return -1;
}
}
/// <summary>
/// 进行数据类型转换
/// </summary>
/// <param name="controlType"></param>
/// <param name="data"></param>
/// <param name="PropertyTypeName"></param>
/// <returns></returns>
private object ReDefineData(Type controlType,Object data, string PropertyTypeName)
{
if (data == null)
return null;
switch (controlType.GetProperty(PropertyTypeName).PropertyType.Name)
{
case "Boolean":
if ((int)data == 1)
data = true;
else
data = false;
break;
case "String":
data = data.ToString();
break;
case "Int32":
data = Convert.ToInt32(data);
break;
case "Double":
data = Convert.ToDouble(data);
break;
default:
break;
}
return data;
}
}
在GetPropertyTypeName里面的类型还不够多。比如如果你用到了RadioButtonList，你可以自己加上对应的属性SelectedValue，在这里就只列这么多了。你可以自己改成更好的实现方法。另外ReDefineData应该也要相应的添加一些对应关现。在看了UpdateFrom的实现以后，其实这个类异常的处理应该要改成
UpdateFrom才更好
，这里就不改了，有空的话我会再改进一下。
另外你还可以写一个类以方便调用
PageUtility
我们还是先看一下UpdateFrom的实现。其实实现很简单，就是先用反射取得对象的所有的属性。然后在Requet.QuerySting或Requet.Form中查找对应的键。如果 找到了对应的值就再调用Property.SetValue方法对其设置属性值。代码如下
UpdateFrom
/// <summary> /// 根据对象自动给相应控件取值或者赋值 /// </summary>
public
class
ValuePicker
{ /// <summary> /// 把对象赋值给相应控件 /// </summary> /// <param name="dataEntity">对象</param> /// <param name="page">要搜索控件的Page或者Master里的ContentPlaceHolder</param> /// <returns></returns> public int SetValue(object dataEntity, Control page) { return OperateValue(dataEntity, page, true); } /// <summary> /// 把相应控件的属性值赋给对象的相应属性 /// </summary> /// <param name="dataEntity">对象</param> /// <param name="page">要搜索控件的Page或者Master里的ContentPlaceHolder</param> /// <returns></returns> public int GetValue(object dataEntity, Control page) { return OperateValue(dataEntity, page, false); } /// <summary> /// 根据每个控件的类型，获取对应操作的属性名称 /// </summary> /// <param name="typeName">控件类型</param> /// <returns></returns> private string GetPropertyTypeName(string typeName) { switch (typeName) { case "TextBox": return "Text"; case "DropDownList": return "SelectedValue"; case "CheckBox": return "Checked"; case "HiddenField": return "Value"; default: return "Text"; } } /// <summary> /// 具体实现赋值和取值的方法 /// </summary> /// <param name="dataEntity">对象</param> /// <param name="page">要搜索控件的Page或者Master里的ContentPlaceHolder</param> /// <param name="isSetting">是否是要设置控件的值</param> /// <returns></returns> private int OperateValue(object dataEntity, Control page, bool isSetting) { try { Type EntityType = dataEntity.GetType(); Type ControlType; //取得所有的属性 PropertyInfo[] Pinfos = EntityType.GetProperties(); ; Control Ctrl; Object Data = null; string PropertyTypeName; //遍历所有的属性 foreach (PropertyInfo Pinfo in Pinfos) { //查找属性对应的控件 Ctrl = page.FindControl(Pinfo.Name); if (Ctrl != null) { ControlType = Ctrl.GetType(); //取得控件存储值的属性 PropertyTypeName = GetPropertyTypeName(ControlType.Name); if (isSetting == true) {//把对象的值设置给控件 Data = EntityType.InvokeMember(Pinfo.Name, BindingFlags.GetProperty, null, dataEntity, null); Data = ReDefineData(ControlType,Data, PropertyTypeName); object[] SettingData ={ Data }; ControlType.InvokeMember(PropertyTypeName, BindingFlags.SetProperty, null, Ctrl, SettingData); } else {//取得控件的值赋给对象对应的属性 Data = ControlType.InvokeMember(PropertyTypeName, BindingFlags.GetProperty, null, Ctrl, null); Data = ReDefineData(EntityType, Data, Pinfo.Name); object[] SettingData ={ Data }; EntityType.InvokeMember(Pinfo.Name, BindingFlags.SetProperty, null, dataEntity, SettingData); } } } return 0; } catch (System.Exception E) { System.Diagnostics.Debug.WriteLine(E.ToString()); //注意 throw (E); return -1; } } /// <summary> /// 进行数据类型转换 /// </summary> /// <param name="controlType"></param> /// <param name="data"></param> /// <param name="PropertyTypeName"></param> /// <returns></returns> private object ReDefineData(Type controlType,Object data, string PropertyTypeName) { if (data == null) return null; switch (controlType.GetProperty(PropertyTypeName).PropertyType.Name) { case "Boolean": if ((int)data == 1) data = true; else data = false; break; case "String": data = data.ToString(); break; case "Int32": data = Convert.ToInt32(data); break; case "Double": data = Convert.ToDouble(data); break; default: break; } return data; } }
另外你还可以写一个类以方便调用
PageUtility