DataGridView.Rows.Count為0

Question

我正在嘗試讀取excel文件的內容（我必須處理數據而不顯示它），但是行數是0。我確實在UI中顯示了數據，並且行沒有數字。

string src = "the path;";
OleDbConnection con = new OleDbConnection(@"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + src +
                                       "Extended Properties=\"Excel 8.0;HDR=Yes;IMEX=1\"");

OleDbDataAdapter da = new OleDbDataAdapter("select * from [RENNES4_wk13$]", con);

DataSet ds = new DataSet();
da.Fill(ds);
DataGridView dgv = new DataGridView();
dgv.DataSource = ds.Tables[0];
int rows = dgv.Rows.Count;
int cells = dgv.Rows[0].Cells.Count;//ArgumentOutOfRange why?

我如何解決它？

Answer 1

試試看

        string src = @"C:\SampleData\us-500.xls";
        OleDbConnection con = new OleDbConnection(@"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + src +
                                          ";Extended Properties=Excel 8.0;");

        //con.Open();
        OleDbDataAdapter da = new OleDbDataAdapter("select * from [MySheet$]", con);
        DataSet ds = new DataSet();
        da.Fill(ds);

        BindingSource bindingSource = new BindingSource();
        bindingSource.DataSource = ds.Tables[0];

        var dataGridView1 = new DataGridView();

        // Add data grid view as child control on form, flow Layout Panel is placed on windows form 
        flowLayoutPanel1.Controls.Add(dataGridView1);

        dataGridView1.DataSource = bindingSource;
        int rows = dataGridView1.Rows.Count;
        int cells = dataGridView1.Rows[0].Cells.Count;

Answer 2

嘗試這個：

BindingSource bindingSource = new BindingSource();
bindingSource.DataSource = resultDt;

在您的情況下：

bindingSource.DataSource = ds.Tables[0];

和：

dgResult.DataSource = bindingSource;
flowLayoutPanel.Controls.Add(dgResult); 

var c = dgResult.Rows.Count;

綁定源負責將數據與控件同步。 您要使用它，而不是嘗試將表直接分配給控件。

參考：

即使有有效的數據源，Datagridview行計數也顯示為0