在 DataGridView 中导入文本文件，C#

问题描述

我有一个问题，在单击按钮时，dataview 应该从文本文件中获取所有数据。 我不明白为什么它不起作用。 我有另一个功能可以将数据放入文本文件中，该功能有效。 任何人都可以帮助我吗？ 提前致谢 This is code of the function which should get all data and put them into the dataviewgrid when I run the program,but there is some problem,I dont get error messages at all,but its not happening . This is code which works really good,it showing all columns and all data will be in text file filling data data which I got in txt file

    private void dodajToolStripMenuItem_Click(object sender,EventArgs e) {
 //upis u datoteku
 using (TextWriter smesti = new StreamWriter("podaci.txt")) {
   for (int i = 0; i < dataGridView1.Rows.Count; i++) {
  if (!dataGridView1.Rows[i].IsNewRow) {
    for (int j = 0; j < dataGridView1.Columns.Count; j++) {
      smesti.Write(dataGridView1.Rows[i].Cells[j].Value.ToString());
      if (j < dataGridView1.Columns.Count - 1) {
        smesti.Write("|");
      }
    }
    smesti.WriteLine();
  }
}

} }

private void Admin_Load(object sender,EventArgs e)
    {
        DataTable tabela = new DataTable();
        tabela.Columns.Add("ID",typeof(int));
        tabela.Columns.Add("Naziv",typeof(string));
        tabela.Columns.Add("Zanr",typeof(string));
        tabela.Columns.Add("Duzina",typeof(int));
        tabela.Columns.Add("Granica godina: ",typeof(int));

        dataGridView1.DataSource = tabela;
        
       
        

    }
   
    private void ucitaj()
    {
        DataTable tabela = new DataTable();
        string[] tekst = File.ReadAllLines("podaci.txt");
        string[] vrednosti;

        for (int i = 0; i < tekst.Length; i++)
        {
            vrednosti = tekst[i].ToString().Split('|');
            string[] red = new string[vrednosti.Length];
            for (int j = 0; j < vrednosti.Length; j++)
            {
                red[j] = vrednosti[j].Trim();
            }
            tabela.Rows.Add(red);
        }
        
    }

    private void button1_Click(object sender,EventArgs e)
    {
        ucitaj();
    }

解决方法

试试下面的代码将网格数据写入文件。代码只是将每个单元格写入文件，然后写入一个 Bar “|”分隔符，除非该单元格是该行的最后一个单元格。我们不希望行尾有分隔符。

private void dodajToolStripMenuItem_Click(object sender,EventArgs e) {
  //upis u datoteku
  using (TextWriter smesti = new StreamWriter("podaci.txt")) {
    for (int i = 0; i < dataGridView1.Rows.Count; i++) {
      if (!dataGridView1.Rows[i].IsNewRow) {
        for (int j = 0; j < dataGridView1.Columns.Count; j++) {
          smesti.Write(dataGridView1.Rows[i].Cells[j].Value.ToString());
          if (j < dataGridView1.Columns.Count - 1) {
            smesti.Write("|");
          }
        }
        smesti.WriteLine();
      }
    }
  }
}

然后在读取文件的代码中......

DataTable tabela;

private void ucitaj() {
  //DataTable tabela = new DataTable();
  tabela.Rows.Clear();
  string[] tekst = File.ReadAllLines("podaci.txt");
  string[] vrednosti;

  for (int i = 0; i < tekst.Length; i++) {
    vrednosti = tekst[i].ToString().Split('|');
    string[] red = new string[vrednosti.Length];
    for (int j = 0; j < vrednosti.Length; j++) {
      red[j] = vrednosti[j].Trim();
    }
    tabela.Rows.Add(red);
  }
  dataGridView1.DataSource = tabela;
}

AND... 您需要将 DataTable ... tabela 移动为全局变量。所以让 tabela 全球化...

DataTable tabela;

然后在 Load 事件中，更改行...

DataTable tabela = new DataTable();

到...

tabela = new DataTable();