Question

我正在使用这个linq查询检查所有6个下拉列表中是否有重复的选择。

要做到这一点，目前我正在为所有下拉列表将SelectedIndex设置为0。而不是那样，我想要那两个下拉列表.SelectedIndex = 0具有相同的SelectedValue。

        var allIndexes = new List<int>
        {
                drpdwnlst_Seq1.SelectedIndex,
                drpdwnlst_Seq2.SelectedIndex,
                drpdwnlst_Seq3.SelectedIndex,
                drpdwnlst_Seq4.SelectedIndex,
                drpdwnlst_Seq5.SelectedIndex,
                drpdwnlst_Seq6.SelectedIndex
        };

        var noSelectedIndexIsTheSame = allIndexes.Where(x => x != 0)
                                     .GroupBy(x => x)
                                     .All(x => x.Count() == 1);

        if (!noSelectedIndexIsTheSame)
        {
            ScriptManager.RegisterStartupScript(Page, Page.GetType(), "AdminUserError", "alert('Selection Rrepeated.'); ", true);

            drpdwnlst_Seq1.SelectedIndex = 0;
            drpdwnlst_Seq2.SelectedIndex = 0;
            drpdwnlst_Seq3.SelectedIndex = 0;
            drpdwnlst_Seq4.SelectedIndex = 0;
            drpdwnlst_Seq5.SelectedIndex = 0;
            drpdwnlst_Seq6.SelectedIndex = 0;
        }

Answer 1

您可以将List更改为以下定义（因此您可以保留大部分逻辑）

List<KeyValuePair<DropDownList, int>> allIndexes = new List<KeyValuePair<DropDownList, int>>
{
    new KeyValuePair<DropDownList, int>(drpdwnlst_Seq1, drpdwnlst_Seq1.SelectedIndex),
    new KeyValuePair<DropDownList, int>(drpdwnlst_Seq2, drpdwnlst_Seq2.SelectedIndex),
    new KeyValuePair<DropDownList, int>(drpdwnlst_Seq3, drpdwnlst_Seq3.SelectedIndex),
    new KeyValuePair<DropDownList, int>(drpdwnlst_Seq4, drpdwnlst_Seq4.SelectedIndex),
    new KeyValuePair<DropDownList, int>(drpdwnlst_Seq5, drpdwnlst_Seq5.SelectedIndex),
    new KeyValuePair<DropDownList, int>(drpdwnlst_Seq6, drpdwnlst_Seq6.SelectedIndex)
};

var groups = allIndexes.Where(x => x.Value != 0).GroupBy(x => x.Value);
boolean noSelectedIndexIsTheSame = groups.All(g => g.Count() == 1);

if (!noSelectedIndexIsTheSame)
{
    ScriptManager.RegisterStartupScript(Page, Page.GetType(), "AdminUserError", "alert('Selection Rrepeated.'); ", true);

    foreach (var g in groups) 
    {
        if (g.Count() == 1) 
        {
            continue;
        }
        foreach (var kvp in g)
        {
            kvp.Key.SelectedIndex = 0;
        }
    }
}

这样，你有你的组合框的引用+当前选择的索引，你按KeyValuePair.Value分组，如果没有索引是相同的，你有一个单独的bool检查。如果是，它将循环组，如果每组发现超过1，重置那些

如果选择重复，则DropDown SelectedIndex设置为0

1 个答案: