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using System.ComponentModel;
using System.Diagnostics.CodeAnalysis;
using System.Web.UI;
using System.Web.UI.WebControls;
namespace System.Web.ModelBinding {
public sealed class ControlValueProvider : SimpleValueProvider {
public string PropertyName {
get;
private set;
}
[SuppressMessage("Microsoft.Globalization", "CA1304:SpecifyCultureInfo", MessageId = "System.Web.ModelBinding.SimpleValueProvider.#ctor(System.Web.ModelBinding.ModelBindingExecutionContext)",
Justification = "SimpleValueProvider Constructor specifies the CultureInfo")]
public ControlValueProvider(ModelBindingExecutionContext modelBindingExecutionContext, string propertyName)
: base(modelBindingExecutionContext) {
PropertyName = propertyName;
}
protected override object FetchValue(string controlId) {
if (String.IsNullOrEmpty(controlId)) {
return null;
}
Control dataControl = ModelBindingExecutionContext.GetService<Control>();
//Following code taken from ControlParameter - code duplicated because ControlPrameter throws exceptions whereas we do not.
string propertyName = PropertyName;
//Bug Fix # 280051 : First try to find it on dataControl as DataBoundControlHelper.FindControl only walks up starting from dataControl's NamingContainer.
Control foundControl = dataControl.FindControl(controlId) ?? DataBoundControlHelper.FindControl(dataControl, controlId);
if (foundControl == null) {
return null;
}
ControlValuePropertyAttribute controlValueProp = (ControlValuePropertyAttribute)TypeDescriptor.GetAttributes(foundControl)[typeof(ControlValuePropertyAttribute)];
// If no property name is specified, use the ControlValuePropertyAttribute to determine which property to use.
if (String.IsNullOrEmpty(propertyName)) {
if ((controlValueProp != null) && (!String.IsNullOrEmpty(controlValueProp.Name))) {
propertyName = controlValueProp.Name;
}
else {
return null;
}
}
// Get the value of the property
object value = DataBinder.Eval(foundControl, propertyName);
// Convert the value to null if this is the default property and the value is the property's default value
if (controlValueProp != null &&
controlValueProp.DefaultValue != null &&
controlValueProp.DefaultValue.Equals(value)) {
return null;
}
return value;
}
}
}
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