【发布时间】：2016-12-11 11:14:37
【问题描述】：
这就是我的代码真正的外观和执行方式。我一直在尝试根据我从数据库中填充的组合框过滤数据，然后在 datagridview 上显示数据。因为我是编码初学者，所以很难编写组合框填充代码。我真的在互联网上搜索，阅读了大部分标题。在完成所有选择之后有什么办法可以做到这一点，也许文本是写在文本框中，搜索按钮（我创建的）根据点击 选择 datagridview 显示。
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Data.SqlClient;
namespace KPI_Tool
{
public partial class SearchForm : Form
{
static SqlConnection conn = new SqlConnection(@"Data Source=(LocalDB)\v11.0;AttachDbFilename=C:\Users\010495\Desktop\KPI_Tool\KPI_Tool\KPI_Store.mdf;Integrated Security=True");
public SearchForm()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
// TODO: This line of code loads data into the 'kPI_StoreDataSet1.Store' table. You can move, or remove it, as needed.
this.myAdapter.Fill(this.myDataSet.Store);
}
private void Group_DropDown(object sender, EventArgs e)
{
conn.Open();
comboBox1.Items.Clear();
SqlCommand cmd = conn.CreateCommand();
cmd.CommandType = CommandType.Text;
cmd.CommandText = "SELECT DISTINCT GroupN FROM Store WHERE GroupN IS NOT NULL";
cmd.ExecuteNonQuery();
DataTable dt = new DataTable();
SqlDataAdapter da = new SqlDataAdapter(cmd);
da.Fill(dt);
foreach (DataRow dr in dt.Rows)
{
comboBox1.Items.Add(dr["GroupN"].ToString());
}
conn.Close();
}
private void Tech_DropDown(object sender, EventArgs e)
{
conn.Open();
comboBox2.Items.Clear();
SqlCommand cmd = conn.CreateCommand();
cmd.CommandType = CommandType.Text;
cmd.CommandText = "SELECT DISTINCT Tech_Area FROM Store WHERE Tech_Area IS NOT NULL";
cmd.ExecuteNonQuery();
DataTable dt = new DataTable();
SqlDataAdapter da = new SqlDataAdapter(cmd);
da.Fill(dt);
foreach (DataRow dr in dt.Rows)
{
comboBox2.Items.Add(dr["Tech_Area"].ToString());
}
conn.Close();
}
private void Level_DropDown(object sender, EventArgs e)
{
conn.Open();
comboBox3.Items.Clear();
SqlCommand cmd = conn.CreateCommand();
cmd.CommandType = CommandType.Text;
cmd.CommandText = "SELECT DISTINCT LevelOf FROM Store WHERE LevelOf IS NOT NULL";
cmd.ExecuteNonQuery();
DataTable dt = new DataTable();
SqlDataAdapter da = new SqlDataAdapter(cmd);
da.Fill(dt);
foreach (DataRow dr in dt.Rows)
{
comboBox3.Items.Add(dr["LevelOf"].ToString());
}
conn.Close();
}
private void Domain_DropDown(object sender, EventArgs e)
{
conn.Open();
comboBox4.Items.Clear();
SqlCommand cmd = conn.CreateCommand();
cmd.CommandType = CommandType.Text;
cmd.CommandText = "SELECT DISTINCT DomainN FROM Store WHERE DomainN IS NOT NULL";
cmd.ExecuteNonQuery();
DataTable dt = new DataTable();
SqlDataAdapter da = new SqlDataAdapter(cmd);
da.Fill(dt);
foreach (DataRow dr in dt.Rows)
{
comboBox4.Items.Add(dr["DomainN"].ToString());
}
conn.Close();
}
private void Type_DropDown(object sender, EventArgs e)
{
conn.Open();
comboBox5.Items.Clear();
SqlCommand cmd = conn.CreateCommand();
cmd.CommandType = CommandType.Text;
cmd.CommandText = "SELECT DISTINCT TypeN FROM Store WHERE TypeN IS NOT NULL";
cmd.ExecuteNonQuery();
DataTable dt = new DataTable();
SqlDataAdapter da = new SqlDataAdapter(cmd);
da.Fill(dt);
foreach (DataRow dr in dt.Rows)
{
comboBox5.Items.Add(dr["TypeN"].ToString());
}
conn.Close();
}
private void Severity_DropDown(object sender, EventArgs e)
{
conn.Open();
comboBox6.Items.Clear();
SqlCommand cmd = conn.CreateCommand();
cmd.CommandType = CommandType.Text;
cmd.CommandText = "SELECT DISTINCT Severity FROM Store WHERE Severity IS NOT NULL";
cmd.ExecuteNonQuery();
DataTable dt = new DataTable();
SqlDataAdapter da = new SqlDataAdapter(cmd);
da.Fill(dt);
foreach (DataRow dr in dt.Rows)
{
comboBox6.Items.Add(dr["Severity"].ToString());
}
conn.Close();
}
private void AlertTB_Click(object sender, MouseEventArgs e)
{
AlertTB.Clear();
}
private void dataGridView1_CellContentClick(object sender, DataGridViewCellEventArgs e)
{
}
private void ListB_Click(object sender, EventArgs e)
{
}
private void ClearB_Clicked(object sender, EventArgs e)
{
comboBox1.SelectedIndex = -1;
comboBox2.SelectedIndex = -1;
comboBox3.SelectedIndex = -1;
comboBox4.SelectedIndex = -1;
comboBox5.SelectedIndex = -1;
comboBox6.SelectedIndex = -1;
AlertTB.Clear();
AlertTB.Text = "Write Here..";
}
private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
{
conn.Open();
myBindingSource.Filter = "GroupN= '{0}'"+comboBox1.SelectedItem.Te;
conn.Close();
}
}
}
这是我的用户界面。我正在使用 Visual Studio Professional 2013。请用非常基本的句子向我解释。我想学习逻辑，代码背后的结构。
【问题讨论】：
标签： c# visual-studio datagridview combobox filtering