private static IEnumerable <SelectListItem> CreateSelectListItem(
DataTable source,
DropDownListOption option,
string selValue = null)
{
var isBindValue = selValue != null;
var selectListItem = new List <SelectListItem>
{
new SelectListItem()
{
Selected = true,
Text = option.TopTitle,
Value = ""
}
};
if (source != null && source.Rows.Count > 0)
{
var drs = source.Select(string.Format("{0} = {1}", option.BaseIdColumnsName, option.TopParentID));
foreach (DataRow dr in drs)
{
//获取ID
var id = dr[option.IdColumnsName].ToString();
//获取类型名称
var typeName = dr[option.DisplayColumnsName].ToString();
//顶级分类显示形式
typeName = option.TopParentStyle + typeName;
//绑定数据
if (isBindValue && id == selValue)
{
selectListItem.Add(new SelectListItem()
{
Text = typeName, Value = id, Selected = true
});
}
else
{
selectListItem.Add(new SelectListItem()
{
Text = typeName, Value = id
});
}
var nowID = -1;
int.TryParse(id, out nowID);
if (nowID > 0)
{
BindNode(selectListItem, source, nowID, option, option.Subkey, isBindValue, selValue);
}
}
}
return(selectListItem);
}
/// <summary>
/// 绑定子分类
/// </summary>
private static void BindNode(List <SelectListItem> e,
DataTable source,
int topParentID,
DropDownListOption option,
string blank,
bool isBindValue,
string selValue = null
)
{
var drs = source.Select(string.Format("{0}= {1}", option.BaseIdColumnsName.Trim(), topParentID));
foreach (var dr in drs)
{
//获取ID
var id = dr[option.IdColumnsName].ToString();
//获取类型名称
var typeName = dr[option.DisplayColumnsName].ToString();
//顶级分类显示形式
typeName = blank + typeName;
if (isBindValue && id == selValue)
{
e.Add(new SelectListItem()
{
Text = typeName, Value = id, Selected = true
});
}
else
{
e.Add(new SelectListItem()
{
Text = typeName, Value = id
});
}
// 设置下一位样式
var nextBlank = blank + "--";
var nowID = -1;
int.TryParse(id, out nowID);
if (nowID > 0)
{
BindNode(e, source, nowID, option, nextBlank, isBindValue, selValue);
}
}
}
/// <summary>
/// 列表控件
/// </summary>
/// <typeparam name="TModel"></typeparam>
/// <typeparam name="TProperty"></typeparam>
/// <param name="htmlHelper"></param>
/// <param name="expression"></param>
/// <param name="source"></param>
/// <param name="option"></param>
/// <param name="selValue"></param>
/// <returns></returns>
public static MvcHtmlString DropDownListExFor <TModel, TProperty>(
this HtmlHelper <TModel> htmlHelper,
Expression <Func <TModel, TProperty> > expression,
IList <SelectListItem> source,
DropDownListOption option,
string selValue = null,
object htmlAttributes = null
)
{
var attrs = ((IDictionary <string, object>) new RouteValueDictionary(htmlAttributes));
if (!string.IsNullOrEmpty(option.Description))
{
attrs.Add("description", option.Description);
}
if (!string.IsNullOrEmpty(option.FocusMsg))
{
attrs.Add("focusMsg", option.FocusMsg);
}
if (option.IsRequired)
{
attrs.Add("isEmpty", "false");
if (!string.IsNullOrEmpty(option.EmptyMsg))
{
attrs.Add("emptyMsg", option.EmptyMsg);
}
else
{
attrs.Add("emptyMsg", "请选择选项");
}
}
else
{
attrs.Add("isEmpty", "true");
}
attrs.Add("validator", "true");
return(htmlHelper.DropDownList(ExpressionHelper.GetExpressionText(expression), source, attrs));
}