Lecture datagridview

Question

J'ai peuplé un datagridview à partir d'un datatable. Comment lire depuis datagridview lorsque l'application est en cours d'exécution?

Answer 1

Comment l'avez-vous peuplé? le DataSource est-il utile comme un BindlingList? Si il est alors quelque chose comme:

BindingSource bindingSource = this.dataGridView1.DataSource as BindingSource; 
//substitute your business object type for T 
T entity = bindingSource.Current as T; 

obtiendriez-vous l'entité liée à la ligne.

Sinon, il y a toujours la datagridview.Columns [n] .Cells [n] .Value mais vraiment je chercherais à l'aide des objets dans le DataSource

Edit: Ah ... un datatable ... righto:

var table = dataGridView1.DataSource as DataTable; 

foreach(DataRow row in table.Rows) 
{ 
    foreach(DataColumn column in table.Columns) 
    { 
     Console.WriteLine(row[column]); 
    } 
} 

Answer 2

Vous pouvez parcourir votre datagridview et récupérer chaque cellule.

for(int i =0; i < DataGridView.Rows.Count; i++){ 
    DataGridView.Rows.Columns["columnName"].Text= ""; 
} 

Il existe un exemple here.

Answer 3

namespace WindowsFormsApplication2 
{ 
    public partial class Form1 : Form 
    { 
     public static DataTable objDataTable = new DataTable("UpdateAddress"); 

     public Form1() 
     { 
      InitializeComponent(); 

     } 

     private void button1_Click(object sender, EventArgs e) 
     { 
      Stream myStream = null; 
      OpenFileDialog openFileDialog1 = new OpenFileDialog(); 

      openFileDialog1.InitialDirectory = "c:\\"; 
      openFileDialog1.Filter = "csv files (*.csv)|*.txt|All files (*.*)|*.*"; 
      openFileDialog1.FilterIndex = 2; 
      openFileDialog1.RestoreDirectory = true; 

      if (openFileDialog1.ShowDialog() == DialogResult.OK) 
      { 
       try 
       { 
        if ((myStream = openFileDialog1.OpenFile()) != null) 
        { 
         string fileName = openFileDialog1.FileName; 

         List<string> dataFile = new List<string>(); 
         dataFile = ReadList(fileName); 
         foreach (string item in dataFile) 
         { 
          string[] temp = item.Split(','); 
          DataRow objDR = objDataTable.NewRow(); 
          objDR["EmployeeID"] = temp[0].ToString(); 
          objDR["Street"] = temp[1].ToString(); 
          objDR["POBox"] = temp[2].ToString(); 
          objDR["City"] = temp[3].ToString(); 
          objDR["State"] = temp[4].ToString(); 
          objDR["Zip"] = temp[5].ToString(); 
          objDR["Country"] = temp[6].ToString(); 
          objDataTable.Rows.Add(objDR); 

         } 
        } 
       } 
       catch (Exception ex) 
       { 
        MessageBox.Show("Error: Could not read file from disk. Original error: " + ex.Message); 
       } 
      } 
     } 

     public static List<string> ReadList(string filename) 
     { 
      List<string> fileData = new List<string>(); 
      StreamReader sr = new StreamReader(filename); 
      while (!sr.EndOfStream) 
       fileData.Add(sr.ReadLine()); 
      return fileData; 
     } 

     private void Form1_Load(object sender, EventArgs e) 
     { 
      objDataTable.Columns.Add("EmployeeID", typeof(int)); 
      objDataTable.Columns.Add("Street", typeof(string)); 
      objDataTable.Columns.Add("POBox", typeof(string)); 
      objDataTable.Columns.Add("City", typeof(string)); 
      objDataTable.Columns.Add("State", typeof(string)); 
      objDataTable.Columns.Add("Zip", typeof(string)); 
      objDataTable.Columns.Add("Country", typeof(string)); 
      objDataTable.Columns.Add("Status", typeof(string)); 

      dataGridView1.DataSource = objDataTable; 
      dataGridView1.Refresh(); 
     } 

     private void button2_Click(object sender, EventArgs e) 
     { 
      // Displays a SaveFileDialog so the user can save the backup of AD address before the update 
      // assigned to Button2. 
      SaveFileDialog saveFileDialog1 = new SaveFileDialog(); 
      saveFileDialog1.Filter = "BAK Files|*.BAK"; 
      saveFileDialog1.Title = "Save AD Backup"; 
      saveFileDialog1.ShowDialog(); 

      if (saveFileDialog1.FileName != "") 
      { 
       TextWriter fileOut = new StreamWriter(saveFileDialog1.FileName); 
       //This is where I want read from the datagridview the EmployeeID column and use it in my BackupAddress method. 
      } 

     } 

Answer 4

Vous pouvez jeter un oeil à DataTable.WriteXml, et son frère DataTable.ReadXml. Pas de problème, pas de sauvegarde d'un DataTable.