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namespace System.Web.ModelBinding {
using System;
using System.ComponentModel.DataAnnotations;
using System.Globalization;
using System.Reflection;
public class DataAnnotationsModelMetadata : ModelMetadata {
private DisplayColumnAttribute _displayColumnAttribute;
public DataAnnotationsModelMetadata(DataAnnotationsModelMetadataProvider provider, Type containerType,
Func<object> modelAccessor, Type modelType, string propertyName,
DisplayColumnAttribute displayColumnAttribute)
: base(provider, containerType, modelAccessor, modelType, propertyName) {
_displayColumnAttribute = displayColumnAttribute;
}
protected override string GetSimpleDisplayText() {
if (Model != null) {
if (_displayColumnAttribute != null && !String.IsNullOrEmpty(_displayColumnAttribute.DisplayColumn)) {
PropertyInfo displayColumnProperty = ModelType.GetProperty(_displayColumnAttribute.DisplayColumn, BindingFlags.Public | BindingFlags.IgnoreCase | BindingFlags.Instance);
ValidateDisplayColumnAttribute(_displayColumnAttribute, displayColumnProperty, ModelType);
object simpleDisplayTextValue = displayColumnProperty.GetValue(Model, new object[0]);
if (simpleDisplayTextValue != null) {
return simpleDisplayTextValue.ToString();
}
}
}
return base.GetSimpleDisplayText();
}
private static void ValidateDisplayColumnAttribute(DisplayColumnAttribute displayColumnAttribute, PropertyInfo displayColumnProperty, Type modelType) {
if (displayColumnProperty == null) {
throw new InvalidOperationException(
String.Format(
CultureInfo.CurrentCulture,
SR.GetString(SR.DataAnnotationsModelMetadataProvider_UnknownProperty),
modelType.FullName, displayColumnAttribute.DisplayColumn));
}
if (displayColumnProperty.GetGetMethod() == null) {
throw new InvalidOperationException(
String.Format(
CultureInfo.CurrentCulture,
SR.GetString(SR.DataAnnotationsModelMetadataProvider_UnreadableProperty),
modelType.FullName, displayColumnAttribute.DisplayColumn));
}
}
}
}
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