Question

有没有办法从ArrayList中删除“列”？

我在尝试从txt文件填充DropDownLists之前启动并运行了这个站点，因此我硬编了每个值。现在我从每个DropDownList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，或者指定在创建ArrayList时引入哪些列，或使用GridView.Columns.Remove（）指定GridView ;因为整数0或1或2似乎与任何东西都不对应，并且网站没有运行，我也无法指定字符串作为要删除的内容的列标题。

DataGrids显示列为| 已启用 | 已选择 | 文字 | 值 |

以下是这篇文章的代码（您可以看到我尝试过的内容，而且我已经评论过的内容不起作用）：

        // Create ListArrays from DropDownLists
        ArrayList BuildingList = new ArrayList(Building.Items);
        ArrayList DepartmentList = new ArrayList(Department.Items);
        //Building.Items.Remove("Enabled");
        //Building.Items.Remove("Selected");

        // Populate Building GridView
        BuildingGrid.DataSource = BuildingList;
        BuildingGrid.DataBind();
        //BuildingGrid.Columns.Remove;
        //BuildingGrid.Columns[0].Visible = false;

        // Populate Department GridView
        DepartmentGrid.DataSource = DepartmentList;
        DepartmentGrid.DataBind();
        //DepartmentGrid.Columns[0].Visible = false;
        //DepartmentGrid.Columns[1].Visible = false;

我会继续在txt文件中创建一个简单的2d数组，其中包含“Value”和“Text”的字段，因此DropDownList会正确地将其拉出来，但我无法解决这个问题，如果没有非常低效的话而且令人困惑。

任何帮助将不胜感激。感谢。

Answer 1

所以，这就是我最终得到的解决方案。我终于想出了如何从txt文件中提取所有内容，并按照我想要的方式将其放置到网格中的方法。

        // 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()));
        }

如何从ArrayList或GridView中删除列c＃

1 个答案: