使用文本框 c# 过滤绑定到数据集的 datagridview

Question

我正在尝试过滤已绑定到数据集的 datagridview。问题是，当我在文本框中输入数据时，应用程序停止并且错误是我尝试过滤的列不存在。我尝试使用字符串查询填充 datagridview 并且过滤工作正常，但我无法更新 datagridview（我不知道为什么）。这就是为什么我用数据集而不是查询来填充它。有什么建议么？这就是我所拥有的：

DataTable dt = new DataTable("Items");
private void LoadDataGrid()
{
using (SqlDataAdapter da = new SqlDataAdapter("SELECT Items.ItemID AS #, Items.SerialNo AS 'SERIALNO', Items.Description AS DESCRIPTION, Items.MaxVoltage, Items.FrameSize, Items.ArrivalDate, Items.DepartureDate, Items.Notes, Items.MechType, Items.[Fix-Drawout], CONCAT(Location.Rack, Location.Row, Location.Columnn, Location.Position) AS LOCATION, ItemStatus.Description AS STATUS, Type.Description AS TYPE, Manufacturers.Description AS MANUFACTURERS FROM Items INNER JOIN Location ON Items.LocationID = Location.LocationID INNER JOIN ItemStatus ON Items.Status = ItemStatus.StatusID INNER JOIN Type ON Items.TypeID = Type.TypeID INNER JOIN Manufacturers ON Items.ManufacturerID = Manufacturers.ManufacturerID", AEAcnn))
{
da.Fill(dt);
dataGridView1.DataSource = dt;
}
}

这是我正在使用的过滤器表达式（带有组合框）

private void txtFilter_KeyPress(object sender, KeyPressEventArgs e)
{
if (cmbFilterSearch.Text == "TYPE")
{
DataView dv = dt.DefaultView;
dv.RowFilter = string.Format("TYPE LIKE '%{0}%'", textBox14.Text);
dataGridView1.DataSource = dv.ToTable();
}
}

当找不到列 TYPE 时，应用程序崩溃，即使名称实际上是 TYPE。

Answer 1

试试这样的：

        if (dt.Rows.Count > 0)
        {
            string str = string.Format("[TYPE] LIKE '%{0}%'", textBox14.Text.Replace("'", "''"));
            dt.CaseSensitive = false;
            DataTable dt1 = dt.Select(str).CopyToDataTable();
            dataGridView1.DataSource = dt1;
        }

Answer 2

尽管列名非常规，但如果您过去使用适配器填充数据表，我看不出代码有任何不正确之处，这显然是这种情况，因为在按键事件之前您没有收到任何错误。由于我们看不到代码的整个上下文，我怀疑您没有绑定您认为的数据，或者绑定正在更改您没有注意到的其他地方。 请参阅this LINQPad script 以证明其有效：

Form frm = new Form();
DataTable dt = new DataTable("Items");
DataGridView dataGridView1 = new DataGridView();
TextBox textBox14 = new TextBox();
TextBox cmbFilterSearch = new TextBox();

void Main()
{   
    PopulateDataTable(dt);  
    BuildForm(frm, dt);
    Application.Run(frm);
}

void BuildForm(Form frm, DataTable dt)
{
    frm.Height = 500;
    frm.Width = 900;

    cmbFilterSearch.Text = "TYPE";
    frm.Controls.Add(cmbFilterSearch);

    textBox14.Text = "filter...";
    textBox14.Location = new Point(0,50);
    frm.Controls.Add(textBox14);
    textBox14.KeyPress += txtFilter_KeyPress;

    dataGridView1.DataSource = dt;
    dataGridView1.Location = new Point(0, 80);
    dataGridView1.AutoGenerateColumns = true;
    dataGridView1.Width = 800;  
    frm.Controls.Add(dataGridView1);
}

void txtFilter_KeyPress(object sender, KeyPressEventArgs e)
{
    if (cmbFilterSearch.Text == "TYPE")
    {
        DataView dv = dt.DefaultView;
        dv.RowFilter = string.Format("TYPE LIKE '%{0}%'", textBox14.Text);
        Console.WriteLine(dv.RowFilter);
        dataGridView1.DataSource = dv.ToTable();
    }
}

void PopulateDataTable(DataTable dt)
{
    dt.Columns.Add("#", typeof(int));
    dt.Columns.Add("'SERIALNO'", typeof(string));
    dt.Columns.Add("DESCRIPTION", typeof(string));
    dt.Columns.Add("MaxVoltage", typeof(string));
    dt.Columns.Add("FrameSize", typeof(string));
    dt.Columns.Add("ArrivalDate", typeof(DateTime));
    dt.Columns.Add("DepartureDate", typeof(DateTime));
    dt.Columns.Add("Notes", typeof(string));
    dt.Columns.Add("MechType", typeof(string));
    dt.Columns.Add("Fix-Drawout", typeof(string));
    dt.Columns.Add("LOCATION", typeof(string));
    dt.Columns.Add("STATUS", typeof(string));
    dt.Columns.Add("TYPE", typeof(string));
    dt.Columns.Add("MANUFACTURERS", typeof(string));

    DataRow row = dt.NewRow();
    row[0] = 1;
    row[1] = "9083290823";
    row[2] = "Mares eat oats";
    row[3] = "12v";
    row[4] = "60";
    row[5] = DateTime.Now;
    row[6] = DateTime.Now.AddDays(7);
    row[7] = "and does eat oats";
    row[8] = "and little lambs";
    row[9] = "eat ivy.";
    row[10] = "Cancelled";
    row[11] = "KEYWORD";
    row[12] = "ACME";
    dt.Rows.Add(row);

    row = dt.NewRow();
    row[0] = 2;
    row[1] = "43537953";
    row[2] = "Mares eat oats";
    row[3] = "12v";
    row[4] = "60";
    row[5] = DateTime.Now;
    row[6] = DateTime.Now.AddDays(7);
    row[7] = "and does eat oats";
    row[8] = "and little lambs";
    row[9] = "eat ivy.";
    row[10] = "Cancelled";
    row[11] = "Reserved Word";
    row[12] = "Conglomico";
    dt.Rows.Add(row);

    row = dt.NewRow();
    row[0] = 3;
    row[1] = "9083290823";
    row[2] = "Mares eat oats";
    row[3] = "12v";
    row[4] = "60";
    row[5] = DateTime.Now;
    row[6] = DateTime.Now.AddDays(7);
    row[7] = "and does eat oats";
    row[8] = "and little lambs";
    row[9] = "eat ivy.";
    row[10] = "Cancelled";
    row[11] = "Identifier";
    row[12] = "Enormico";
    dt.Rows.Add(row);

}

Answer 3

试试这个方法。

using System;
using System.Data;
using System.Data.SqlClient;
using System.Windows.Forms;

namespace WindowsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            string connetionString = null;
            SqlConnection connection ;
            SqlCommand command ;
            SqlDataAdapter adapter = new SqlDataAdapter();
            DataSet ds = new DataSet();
            DataView dv ;
            string sql = null;
            connetionString = "Data Source=ServerName;Initial Catalog=DatabaseName;User ID=UserName;Password=Password";
            sql = "Select * from product";
            connection = new SqlConnection(connetionString);
            try
            {
                connection.Open();
                command = new SqlCommand(sql, connection);
                adapter.SelectCommand = command;
                adapter.Fill(ds, "Filter DataView");
                adapter.Dispose();
                command.Dispose();
                connection.Close();

                dv = new DataView(ds.Tables[0], "Product_Price < = 3000", "Product_Name", DataViewRowState.CurrentRows);

                dataGridView1.DataSource = dv;
            }
            catch (Exception ex)
            {
                MessageBox.Show (ex.ToString());
            }
        }
    }
}