internal static string CollectionTemplate(HtmlHelper html,
Html5TemplateHelpers.TemplateHelperDelegate templateHelper,
object attributes = null)
{
object model = html.ViewContext.ViewData.ModelMetadata.Model;
if(model == null)
{
return String.Empty;
}
IEnumerable collection = model as IEnumerable;
if(collection == null)
{
throw new InvalidOperationException(
String.Format(
CultureInfo.CurrentCulture,
"The Collection template was used with an object of type '{0}', which does not implement System.IEnumerable.",
model.GetType().FullName
)
);
}
Type typeInCollection = typeof(string);
Type genericEnumerableType = Html5TypeHelpers.ExtractGenericInterface(collection.GetType(),
typeof(IEnumerable<>));
if(genericEnumerableType != null)
{
typeInCollection = genericEnumerableType.GetGenericArguments()[0];
}
bool typeInCollectionIsNullableValueType = Html5TypeHelpers.IsNullableValueType(typeInCollection);
string oldPrefix = html.ViewContext.ViewData.TemplateInfo.HtmlFieldPrefix;
try
{
html.ViewContext.ViewData.TemplateInfo.HtmlFieldPrefix = String.Empty;
string fieldNameBase = oldPrefix;
StringBuilder result = new StringBuilder();
int index = 0;
foreach(object item in collection)
{
Type itemType = typeInCollection;
if(item != null && !typeInCollectionIsNullableValueType)
{
itemType = item.GetType();
}
ModelMetadata metadata = ModelMetadataProviders.Current.GetMetadataForType(() => item, itemType);
string fieldName = String.Format(CultureInfo.InvariantCulture, "{0}[{1}]", fieldNameBase, index++);
string output = templateHelper(html,
metadata,
fieldName,
null /* templateName */,
DataBoundControlMode.ReadOnly,
null /* additionalViewData */,
attributes);
result.Append(output);
}
return result.ToString();
}
finally
{
html.ViewContext.ViewData.TemplateInfo.HtmlFieldPrefix = oldPrefix;
}
}
internal static string ObjectTemplate(HtmlHelper html,
Html5TemplateHelpers.TemplateHelperDelegate templateHelper,
object attributes = null)
{
ViewDataDictionary viewData = html.ViewContext.ViewData;
TemplateInfo templateInfo = viewData.TemplateInfo;
ModelMetadata modelMetadata = viewData.ModelMetadata;
StringBuilder builder = new StringBuilder();
if(modelMetadata.Model == null)
{
// DDB #225237
return modelMetadata.NullDisplayText;
}
if(templateInfo.TemplateDepth > 1)
{
// DDB #224751
return modelMetadata.SimpleDisplayText;
}
foreach(ModelMetadata propertyMetadata in modelMetadata.Properties.Where(pm => ShouldShow(pm, templateInfo))
)
{
if(!propertyMetadata.HideSurroundingHtml)
{
string label = propertyMetadata.GetDisplayName();
if(!String.IsNullOrEmpty(label))
{
builder.AppendFormat(CultureInfo.InvariantCulture,
"<div class=\"display-label\">{0}</div>",
label);
builder.AppendLine();
}
builder.Append("<div class=\"display-field\">");
}
builder.Append(templateHelper(html,
propertyMetadata,
propertyMetadata.PropertyName,
null /* templateName */,
DataBoundControlMode.ReadOnly,
null /* additionalViewData */,
attributes));
if(!propertyMetadata.HideSurroundingHtml)
{
builder.AppendLine("</div>");
}
}
return builder.ToString();
}
