c# - Linq 代码无法正常工作

Question

我编写了以下代码，以便在 GridView 中组合所有选中复选框(true)的行的列值“lblJurisdiction”

if (grdView.Rows.Count > 0)
{
    foreach (GridViewRow row in grdView.Rows)
    {
        CheckBox chkbox = row.FindControl("chkbox") as CheckBox;
        Label lblJurisdiction = row.FindControl("lblJurisdiction") as Label;
        bool saveThis = chkbox.Checked;
        if (saveThis == true)
        {
            List<String> Items = new List<String>();
            Items.Add(lblJurisdiction.Text);
            Items.Sort();
            List<string> Unique = Items.Distinct().ToList();
            string ReplacedJurisdiction = string.Join(",", Unique.ToArray());
            hdnJurisdiction.Value = ReplacedJurisdiction;
        }
    }
}

例如 GridView 包含

• [true] [阿拉巴马州] [一些值]
• [true] [阿拉斯加] [一些值]
• [false] [纽约] [一些值]
• [false] [加利福尼亚] [一些值]

现在隐藏字段应该包含 Alabama, Alaska它只结合了一个，即阿拉斯加......

Answer 1

你应该改变你的变量范围!您应该在 foreach 循环之外声明您的列表，并在完成计算后设置值。我还更改了您的代码以匹配 C# 中的常见命名和编码约定。

if (grdView.Rows.Count > 0)
{
    var states = new List<string>();
    foreach (GridViewRow row in grdView.Rows)
    {
        var chkbox = row.FindControl("chkbox") as CheckBox;
        if (chkbox.Checked)
        {
            var lblJurisdiction = row.FindControl("lblJurisdiction") as Label;
            states.Add(lblJurisdiction.Text);
        }
    }
    hdnJurisdiction.Value = string.Join(", ", states.Distinct().OrderBy(x => x));
}