Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System.Web/ModelBinding/ControlValueProvider.cs

@@ -0,0 +1,63 @@
+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;
+        }
+    }
+}