C# 如何从ArrayList或GridView c中删除列#

有没有办法从ArrayList中删除“列”

在尝试从txt文件填充DropDownList之前，我已经建立并运行了这个站点，所以我硬输入了每个值。现在我已经从每个DropDownList中创建了一个ArrayList，这样我就可以在站点上的DataGridView中显示这些列表。唯一的问题是“Enabled”和“Selected”显示为列，我似乎无法删除ArrayList中的列，也无法指定在使用GridView.columns.remove（）创建ArrayList或GridView时要引入哪些列；因为整数0、1或2似乎与任何内容都不对应，站点也没有运行，我无法指定字符串作为要删除的列标题

数据网格显示为启用的列选中的列文本值|

下面是这篇文章的代码（你可以看到我试过的东西，但没有用，我已经注释掉了）：

我会继续在一个txt文件中创建一个简单的2d数组，其中包含“值”和“文本”字段，这样DropDownList就可以正确地将其拉入，但我也无法在效率非常低和令人困惑的情况下理解这一点

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任何帮助都将不胜感激。谢谢。

所以，这是我最后的解决方案。我终于想出了如何从txt文件中提取所有内容，并以我想要的方式将其放入网格中

        // Populate Department GridView
        // get all lines of csv file
        string[] BuildingString = File.ReadAllLines(Server.MapPath("Content/BuildingsCSV.csv"));
        string[] DepartmentString = File.ReadAllLines(Server.MapPath("Content/DepartmentsCSV.csv"));
        // create new datatable
        DataTable BuildingTable = new DataTable();
        DataTable DepartmentTable = new DataTable();

        // Building Table
        // get the column header means first line
        string[] tempbuild = BuildingString[0].Split(',');
        // creates columns of gridview as per the header name
        foreach (string t in tempbuild)
        {
            BuildingTable.Columns.Add(t, typeof(string));
        }
        // now retrive the record from second line and add it to datatable
        for (int i = 1; i < BuildingString.Length; i++)
        {
            string[] t = BuildingString[i].Split(',');
            BuildingTable.Rows.Add(t);
        }
        // Department Table
        // get the column header means first line
        string[] tempdept = DepartmentString[0].Split(',');
        // creates columns of gridview as per the header name
        foreach (string t in tempdept)
        {
            DepartmentTable.Columns.Add(t, typeof(string));
        }
        // now retrive the record from second line and add it to datatable
        for (int i = 1; i < DepartmentString.Length; i++)
        {
            string[] t = DepartmentString[i].Split(',');
            DepartmentTable.Rows.Add(t);
        }
        // assign gridview datasource property by datatable
        BuildingGrid.DataSource = BuildingTable;
        BuildingGrid.DataBind();
        BuildingGrid.Rows[0].Visible = false;
        DepartmentGrid.DataSource = DepartmentTable;
        DepartmentGrid.DataBind();
        DepartmentGrid.Rows[0].Visible = false;

        foreach (DataRow drb in BuildingTable.Rows)
        {
            BuildingDrop.Items.Add(new ListItem(drb[0].ToString(), drb[1].ToString()));
        }
        foreach (DataRow drd in DepartmentTable.Rows)
        {
            DepartmentDrop.Items.Add(new ListItem(drd[0].ToString(), drd[1].ToString()));
        }

//填充部门GridView
//获取csv文件的所有行
string[]BuildingString=File.ReadAllLines（Server.MapPath（“Content/buildingscv.csv”）；
string[]DepartmentString=File.ReadAllLines（Server.MapPath（“Content/DepartmentsCSV.csv”）；
//创建新数据表
DataTable BuildingTable=新DataTable（）；
DataTable DepartmentTable=新DataTable（）；
//建筑表
//获取列标题表示第一行
字符串[]tempbuild=BuildingString[0]。拆分（'，'）；
//根据标题名称创建gridview的列
foreach（tempbuild中的字符串t）
{
Add（t，typeof（string））；
}
//现在从第二行检索记录并将其添加到datatable
for（int i=1；i

DepartmentGrid.Columns[“ColumnName”]。Visible=false？不幸的是，没有（我忘了把它和注释一起放进去）。获取pushback“参数1：无法从'string'转换为'int'”我建议您将数据源绑定到集合而不是ArrayList，并对要隐藏的属性使用
[Browsable（false）]
属性。我相信DropDownList项是一个集合，它们只包含“enabled”和“enabled”的布尔值“被选中”，对吗？
        // Populate Department GridView
        // get all lines of csv file
        string[] BuildingString = File.ReadAllLines(Server.MapPath("Content/BuildingsCSV.csv"));
        string[] DepartmentString = File.ReadAllLines(Server.MapPath("Content/DepartmentsCSV.csv"));
        // create new datatable
        DataTable BuildingTable = new DataTable();
        DataTable DepartmentTable = new DataTable();

        // Building Table
        // get the column header means first line
        string[] tempbuild = BuildingString[0].Split(',');
        // creates columns of gridview as per the header name
        foreach (string t in tempbuild)
        {
            BuildingTable.Columns.Add(t, typeof(string));
        }
        // now retrive the record from second line and add it to datatable
        for (int i = 1; i < BuildingString.Length; i++)
        {
            string[] t = BuildingString[i].Split(',');
            BuildingTable.Rows.Add(t);
        }
        // Department Table
        // get the column header means first line
        string[] tempdept = DepartmentString[0].Split(',');
        // creates columns of gridview as per the header name
        foreach (string t in tempdept)
        {
            DepartmentTable.Columns.Add(t, typeof(string));
        }
        // now retrive the record from second line and add it to datatable
        for (int i = 1; i < DepartmentString.Length; i++)
        {
            string[] t = DepartmentString[i].Split(',');
            DepartmentTable.Rows.Add(t);
        }
        // assign gridview datasource property by datatable
        BuildingGrid.DataSource = BuildingTable;
        BuildingGrid.DataBind();
        BuildingGrid.Rows[0].Visible = false;
        DepartmentGrid.DataSource = DepartmentTable;
        DepartmentGrid.DataBind();
        DepartmentGrid.Rows[0].Visible = false;

        foreach (DataRow drb in BuildingTable.Rows)
        {
            BuildingDrop.Items.Add(new ListItem(drb[0].ToString(), drb[1].ToString()));
        }
        foreach (DataRow drd in DepartmentTable.Rows)
        {
            DepartmentDrop.Items.Add(new ListItem(drd[0].ToString(), drd[1].ToString()));
        }