get { return this.IsTrackingViewState; }
}
+ // MSDN: The ToString method returns the Name property of the Parameter object. If the Parameter object has no name, ToString returns String.Empty.
public override string ToString ()
{
return Name;
}
- [WebCategoryAttribute ("Parameter"), DefaultValueAttribute (""),
- WebSysDescriptionAttribute ("Default value to be used in case value is null.") ]
+ [WebCategoryAttribute ("Parameter")]
+ [DefaultValueAttribute (null)]
+ [WebSysDescriptionAttribute ("Default value to be used in case value is null.")]
public string DefaultValue {
- get {
- return ViewState ["DefaultValue"] as string;
- }
+ get { return ViewState.GetString ("DefaultValue", null); }
set {
if (DefaultValue != value) {
}
}
- [WebCategoryAttribute ("Parameter"), DefaultValueAttribute ("Input"),
- WebSysDescriptionAttribute ("Parameter's direction.")]
+ [WebCategoryAttribute ("Parameter")]
+ [DefaultValueAttribute ("Input")]
+ [WebSysDescriptionAttribute ("Parameter's direction.")]
public ParameterDirection Direction
{
- get {
- object o = ViewState ["Direction"];
- if (o != null)
- return (ParameterDirection) o;
-
- return ParameterDirection.Input;
- }
+ get { return (ParameterDirection) ViewState.GetInt ("Direction", (int)ParameterDirection.Input); }
set {
if (Direction != value) {
ViewState ["Direction"] = value;
}
- [WebCategoryAttribute ("Parameter"), DefaultValueAttribute (""),
- WebSysDescriptionAttribute ("Parameter's name.")]
+ [WebCategoryAttribute ("Parameter")]
+ [DefaultValueAttribute ("")]
+ [WebSysDescriptionAttribute ("Parameter's name.")]
public string Name
{
get {
}
}
- [WebCategoryAttribute ("Parameter"), DefaultValueAttribute (true),
- WebSysDescriptionAttribute ("Checks whether an empty string is treated as a null value.")]
+ [WebCategoryAttribute ("Parameter")]
+ [DefaultValueAttribute (true)]
+ [WebSysDescriptionAttribute ("Checks whether an empty string is treated as a null value.")]
public bool ConvertEmptyStringToNull
{
- get {
- object o = ViewState["ConvertEmptyStringToNull"];
- if (o != null)
- return (bool) o;
-
- return true;
- }
+ get { return ViewState.GetBool ("ConvertEmptyStringToNull", true); }
set {
if (ConvertEmptyStringToNull != value) {
ViewState["ConvertEmptyStringToNull"] = value;
}
}
- [DefaultValueAttribute (TypeCode.Object)]
+ [DefaultValue (0)]
+ public int Size {
+ get { return ViewState.GetInt ("Size", 0); }
+ set {
+ if (Size != value) {
+ ViewState["Size"] = value;
+ OnParameterChanged ();
+ }
+ }
+ }
+
+ [DefaultValueAttribute (TypeCode.Empty)]
[WebCategoryAttribute ("Parameter"),
WebSysDescriptionAttribute("Represents type of the parameter.")]
public TypeCode Type
{
- get {
- object o = ViewState ["Type"];
- if (o != null)
- return (TypeCode) o;
-
- return TypeCode.Object;
- }
+ get { return (TypeCode) ViewState.GetInt ("Type", (int)TypeCode.Empty); }
set {
if (Type != value) {
}
StateBag viewState;
-
[BrowsableAttribute (false),
DesignerSerializationVisibilityAttribute (DesignerSerializationVisibility.Hidden)]
protected StateBag ViewState {
get { return isTrackingViewState; }
}
+ // MSDN: The default implementation of the Evaluate method is to return
+ // a null reference (Nothing in Visual Basic) in all cases.
+ // Classes that derive from the Parameter class override the Evaluate method
+ // to return an updated parameter value. For example, the ControlParameter object
+ // returns the value of the control that it is bound to, while
+ // the QueryStringParameter object retrieves the current name/value pair from
+ // the HttpRequest object.
protected virtual object Evaluate (HttpContext context, Control control)
{
- return this.DefaultValue;
+ return null;
}
-
- internal object GetValue (HttpContext context, Control control)
+
+ internal void UpdateValue (HttpContext context, Control control)
{
object oldValue = ViewState ["ParameterValue"];
-
- object newValue = ConvertValue (Evaluate (context, control));
- if (newValue == null)
- newValue = ConvertValue (DefaultValue);
+
+ object newValue = Evaluate (context, control);
if (!object.Equals (oldValue, newValue)) {
ViewState ["ParameterValue"] = newValue;
OnParameterChanged ();
}
- return newValue;
+ }
+
+ internal object GetValue (HttpContext context, Control control)
+ {
+ UpdateValue (context, control);
+
+ object value = ConvertValue (ViewState ["ParameterValue"]);
+ if (value == null)
+ value = ConvertValue (DefaultValue);
+
+ return value;
}
- object ConvertValue (object val)
+ internal object ConvertValue (object val)
{
if (val == null) return null;
if (ConvertEmptyStringToNull && val.Equals (string.Empty))
return null;
- return Convert.ChangeType (val, Type);
+ return Type != TypeCode.Empty ? Convert.ChangeType (val, Type) : val;
}
protected internal virtual void SetDirty()