/// <summary>
/// 对 HTML 中的 script 元素进行绑定
/// </summary>
/// <param name="context">当前绑定上下文</param>
/// <param name="element">当前绑定的元素（仅会对 script 元素起作用）</param>
/// <returns>永远返回 false，表示其他绑定器可以继续执行</returns>
public void BindElement(HtmlBindingContext context, IHtmlElement element)
{
if (!element.Name.EqualsIgnoreCase("script"))
{
return;
}
var script = element.InnerHtml();
script = scriptBindingExpression.Replace(script, match =>
{
var expression = BindingExpression.ParseExpression(match.Groups["expression"].Value);
if (expression == null)
{
return(match.Value);
}
object dataObject = context.GetValue(expression);
var valueExpression = serializer.Serialize(dataObject);
return(match.Groups["declare"].Value + valueExpression + ";");
});
element.InnerHtml(script);
}
/// <summary>
/// 创建一个绑定上下文
/// </summary>
/// <param name="bindingContext">目前的绑定上下文</param>
/// <param name="element">目前正在进行绑定的元素</param>
/// <param name="dataModel">元素上绑定的数据对象</param>
/// <returns></returns>
protected HtmlBindingContext CreateBindingContext(HtmlBindingContext bindingContext, IHtmlElement element, object dataModel)
{
var listData = dataModel as ListDataModel;
if (listData != null)
{
return(new HtmlListBindingContext(bindingContext, element, listData));
}
return(new HtmlBindingContext(bindingContext, element, dataModel));
}
/// <summary>
/// 创建绑定上下文
/// </summary>
/// <param name="scope">要进行数据绑定的范围</param>
/// <param name="dataModel">数据模型</param>
/// <param name="binders">在这一次数据绑定中要用到的绑定器列表</param>
/// <returns>绑定上下文</returns>
public static HtmlBindingContext Create(IHtmlContainer scope, object dataModel, params object[] binders)
{
var elementBinders = new List <IHtmlBinder>();
var expressionBinders = new List <IExpressionBinder>();
foreach (var item in binders)
{
{
var binder = item as IHtmlBinder;
if (binder != null)
{
elementBinders.Add(binder);
continue;
}
}
{
var binder = item as IExpressionBinder;
if (binder != null)
{
expressionBinders.Add(binder);
continue;
}
}
{
var list = item as IEnumerable <IHtmlBinder>;
if (list != null)
{
elementBinders.AddRange(list);
continue;
}
}
{
var list = item as IEnumerable <IExpressionBinder>;
if (list != null)
{
expressionBinders.AddRange(list);
continue;
}
}
throw new ArgumentException(string.Format("不支持 \"{0}\" 类型的绑定器", item.GetType().ToString()), "binders");
}
var context = HtmlBindingContext.Create(elementBinders.ToArray(), expressionBinders.ToArray(), scope, dataModel);
return(context);
}
/// <summary>
/// 根据绑定参数获取数据对象
/// </summary>
/// <param name="context">绑定上下文</param>
/// <param name="arguments">绑定参数</param>
/// <returns>数据对象</returns>
public static object GetDataObject(HtmlBindingContext context, BindingExpression expression)
{
object dataObject = context.DataModel;
if (dataObject != null)
{
string path;
if (expression.TryGetValue(context, "path", out path))
{
if (dataObject == null)
{
return(null);
}
dataObject = DataBinder.Eval(dataObject, path);
}
}
object value;
if (expression.TryGetValue(context, "value", out value))
{
if (dataObject != null && Convert.ToBoolean(dataObject) == true)
{
return(value);
}
else if (expression.TryGetValue(context, "alternativeValue", out value))
{
return(value);
}
else
{
return(null);
}
}
return(dataObject);
}
/// <summary>
/// 绑定元素
/// </summary>
/// <param name="context">当前绑定上下文</param>
/// <param name="element">要绑定的元素</param>
/// <returns>永远返回 false，表示继续进行后面的绑定</returns>
public void BindElement(HtmlBindingContext context, IHtmlElement element)
{
if (!element.Document.HtmlSpecification.IsCDataElement(element.Name))
{
return;
}
if (element.Attribute("literal-binder") == null)
{
return;
}
lock (element.SyncRoot)
{
var text = element.InnerHtml();
text = LiteralBind(text);
}
}
/// <summary>
/// 创建 HtmlBindingContext 实例
/// </summary>
/// <param name="scope">要进行数据绑定的范畴</param>
/// <param name="bindingContext">父级数据绑定上下文</param>
/// <param name="dataModel">数据模型，若不提供则使用当前的数据模型</param>
protected HtmlBindingContext(HtmlBindingContext bindingContext, IHtmlContainer scope, object dataModel = null)
{
if (bindingContext == null)
{
throw new ArgumentNullException("bindingContext");
}
if (scope == null)
{
throw new ArgumentNullException("scope");
}
ParentContext = bindingContext;
BindingScope = scope;
DataModel = dataModel ?? bindingContext.DataModel;
Binders = bindingContext.Binders;
_expressionBinders = new ExpressionBinderCollection(bindingContext._expressionBinders);
}
/// <summary>
/// 对元素进行数据绑定
/// </summary>
/// <param name="element">需要绑定数据的元素</param>
/// <param name="context">绑定上下文</param>
/// <returns>返回是否对元素进行了不可逆转的操作（例如移除），故而禁止后续的绑定操作</returns>
public void BindElement(HtmlBindingContext context, IHtmlElement element)
{
if (element.Attribute("binding-visible") != null)
{
var visible = element.Attribute("binding-visible").Value();
if (visible.EqualsIgnoreCase("false") || visible.EqualsIgnoreCase("hidden") || visible.EqualsIgnoreCase("invisible"))
{
element.Remove();
context.CancelChildsBinding = context.BindCompleted = true;
}
}
{
//处理样式类
var classAttribute = element.Attribute(classAttributePrefix);
if (classAttribute != null)
{
if (!string.IsNullOrWhiteSpace(classAttribute.AttributeValue))
{
var classes = Regulars.whiteSpaceSeparatorRegex.Split(classAttribute.AttributeValue).Where(c => c != "").ToArray();
if (classes.Any())
{
element.Class(classes);
}
}
element.RemoveAttribute(classAttributePrefix);
}
}
{
var classAttributes = element.Attributes().Where(a => a.Name.StartsWith(classAttributePrefix)).ToArray();
BindElementClasses(element, classAttributes);
}
//处理CSS样式
var styleAttributes = element.Attributes().Where(a => a.Name.StartsWith(styleAttributePrefix)).ToArray();
BindElementStyles(element, styleAttributes);
}
/// <summary>
/// 获取绑定值
/// </summary>
/// <param name="context">绑定上下文</param>
/// <param name="arguments">绑定参数</param>
/// <returns>绑定值</returns>
public static string GetValue(HtmlBindingContext context, BindingExpression expression)
{
var dataObject = GetDataObject(context, expression);
if (dataObject == null)
{
return(null);
}
{
string format;
if (expression.TryGetValue(context, "format", out format))
{
if (format.Contains("{0"))
{
return(string.Format(CultureInfo.InvariantCulture, format, dataObject));
}
else
{
var formattable = dataObject as IFormattable;
if (formattable != null)
{
return(formattable.ToString(format, CultureInfo.InvariantCulture));
}
else
{
return(dataObject.ToString());
}
}
}
}
return(dataObject.ToString());
}
object IExpressionBinder.GetValue(HtmlBindingContext context, BindingExpression expression)
{
var dataModel = GetDataObject(context, expression);
if (dataModel == null)
{
return(null);
}
CssElementSelector elementSelector = null;
string selector;
if (expression.TryGetValue(context, "selector", out selector))
{
elementSelector = CssParser.ParseElementSelector(selector);
}
ListBindingMode mode;
string modeSetting;
if (expression.TryGetValue(context, "mode", out modeSetting) && modeSetting.EqualsIgnoreCase("static"))
{
mode = ListBindingMode.StaticContent;
}
else
{
mode = ListBindingMode.DynamicContent;
}
return(new ListDataModel((IEnumerable)dataModel, elementSelector, mode));
}
/// <summary>
/// 使用默认的绑定器设置创建 HtmlBindingContext 实例
/// </summary>
/// <param name="scope">要进行数据绑定的范畴</param>
/// <param name="dataModel">数据模型</param>
public static HtmlBindingContext Create(IHtmlContainer scope, object dataModel)
{
return(HtmlBindingContext.Create(ElementBinders.ToArray(), ExpressionBinders.ToArray(), scope, dataModel));
}
object IExpressionBinder.GetValue(HtmlBindingContext context, BindingExpression expression)
{
return(GetValue(context, expression));
}
internal HtmlListBindingContext(HtmlBindingContext context, IHtmlElement element, ListDataModel dataModel)
: base(context, element, dataModel)
{
DataModel = dataModel;
BindingElement = element;
}
public HtmlBindingContext CreateBindingContext(HtmlBindingContext bindingContext, IHtmlContainer scope, object datamodel)
{
return(new HtmlListBindingContext(bindingContext, (IHtmlElement)scope, (ListDataModel)datamodel));
}