/// <summary>
/// 将客户端提交来的值，应用到对应的输入控件上
/// </summary>
/// <param name="group">输入控件</param>
public static IHtmlGroupControl ApplySubmittedValue(this IHtmlGroupControl group)
{
if (group == null)
{
throw new ArgumentNullException("group");
}
var values = SubmittedValues(group);
if (values == null)
{
return(group);
}
ClearValues(group);
if (values.Any(v => group.Item(v) == null))
{
throw new InvalidOperationException();
}
foreach (var value in values)
{
if (!TrySetValue(group, value))
{
throw new InvalidOperationException();
}
}
return(group);
}
/// <summary>
/// 获取输入组当前所有选中的值
/// </summary>
/// <param name="group">输入组</param>
/// <returns></returns>
public static IEnumerable <string> CurrentValues(this IHtmlGroupControl group)
{
if (group == null)
{
throw new ArgumentNullException("group");
}
return(group.Items.Where(item => item.Selected).Select(item => item.Value));
}
/// <summary>
/// 清空输入组所有选中的值
/// </summary>
/// <param name="group">输入组</param>
public static void ClearValues(this IHtmlGroupControl group)
{
if (group == null)
{
throw new ArgumentNullException("group");
}
group.Items.ForAll(item => item.Selected = false);
}
/// <summary>
/// 尝试为输入组设置一个值
/// </summary>
/// <param name="group">输入组</param>
/// <param name="value">要设置的值</param>
/// <returns>是否成功</returns>
/// <remarks>此方法暂不支持设置多个用逗号分隔的值</remarks>
public static bool TrySetValue(this IHtmlGroupControl group, string value)
{
var item = Item(group, value);
if (item == null)
{
return(false);
}
item.Selected = true;
return(true);
}
/// <summary>
/// 通过 value 获取输入组项
/// </summary>
/// <param name="group">输入组</param>
/// <param name="value">要查找输入组项的值</param>
/// <returns>输入组项，如果没有找到则返回 false</returns>
public static IHtmlInputGroupItem Item(this IHtmlGroupControl group, string value)
{
if (group == null)
{
throw new ArgumentNullException("group");
}
if (value == null)
{
throw new ArgumentNullException("value");
}
return(group.Items.Where(item => item.Value == value).SingleOrDefault());
}
/// <summary>
/// 尝试为输入组设置一个值
/// </summary>
/// <param name="group">输入组</param>
/// <param name="value">要设置的值</param>
/// <returns>是否成功</returns>
/// <remarks>此方法暂不支持设置多个用逗号分隔的值</remarks>
public static bool TrySetValue(this IHtmlGroupControl group, string value)
{
if (group == null)
{
throw new ArgumentNullException("group");
}
group.ClearValues();
if (string.IsNullOrEmpty(value))
{
return(true);
}
bool success = true;
if (group.AllowMultipleSelections)
{
foreach (var v in value.Split(','))
{
var item = Item(group, v);
if (item == null)
{
success = false;
}
else
{
item.Selected = true;
}
}
return(success);
}
else
{
var item = Item(group, value);
if (item == null)
{
return(false);
}
item.Selected = true;
return(true);
}
}
/// <summary>
/// 获取指定输入组在客户端设置的值
/// </summary>
/// <param name="group">输入组</param>
/// <returns></returns>
public static string[] SubmittedValues(this IHtmlGroupControl group)
{
if (group == null)
{
throw new ArgumentNullException("group");
}
var data = group.Form.SubmittedValues;
if (data == null)
{
return(null);
}
if (!data.AllKeys.Contains(group.Name))
{
return(new string[0]);
}
return(data.GetValues(group.Name));
}