displaying multiple datatable in tabcontrol C#

问题

i have a small program that takes a datatable (takes data from sql database) then splits it into datatable array by field and then should display it in a tabcontrol, each field in it's own tab

the split, takes single datatable and splits into datatable array, works fine i think

public DataTable[] splitTable(DataTable mainDT,string columnName)
    {
        int tmp=0;
        DataTable[] splitDT = new DataTable[11];
        for (int i=0;i<11;i++)
            splitDT[i]=new DataTable();



        foreach (DataRow row in mainDT.Rows)
        {              
           tmp = row[columnName].GetHashCode();
           splitDT[tmp].ImportRow(row);
        }
        return splitDT;
    }

here is the problem part

public Display(string Name, string rname, DataTable[] left,int tabNum)
    {
        InitializeComponent();
        TabPage tp;
        DataGridView dgw;

        lLeftTable.Text = Name;

        for (int i = 0; i < tabNum;i++ )
        {
            tp = new TabPage(""+i);
            dgw = new DataGridView();
            dgw.DataSource = left[i];
            tp.Controls.Add(dgw);
            tbcLeftPages.Controls.Add(tp);
            tbcLeftPages.Refresh();
        }

    }

it opens a tabcontrol with the right amount of tabs but no data in them

EDIT 1 still no good, show tabs with no gridview changed it into a function that get's parts of the datatable array

 public void addDGWtoTab(DataTable dt,string side,int num)
        {
        MessageBox.Show("table:" + side + " bucket:" + num + "rows:" + dt.Rows.Count);
        DataGridView dgw = new DataGridView();
        TabPage tp = new TabPage();

        //data grid view
        dgw.Name = "dgv" + num;
        dgw.AutoSize = true;
        dgw.Dock = DockStyle.Fill;

        //tab page
        tp.Name = "tp" + num;
        tp.Text = "Bucket " + num;
        tp.Tag = dt.Rows.Count;
        tp.TabIndex = num;

        if (side == "left")             
            tbcLeftPages.Controls.Add(tp);   
        else tbcRightPages.Controls.Add(tp);
        dgw.DataSource = dt; 
        tp.Controls.Add(dgw);

    }

EDIT 2 added spitDT

public DataTable[] splitTable(DataTable mainDT,string columnName,int mod)
    {
        DataTable[] splitDT = new DataTable[11];
        for (int i=0;i<11;i++)
            splitDT[i]=new DataTable();

        int splitINT;
        int tmp=0;

        foreach (DataRow row in mainDT.Rows)
        {              
           splitINT = row[columnName].GetHashCode();
           tmp = splitINT % mod;
           splitDT[tmp].ImportRow(row);
        }

        return splitDT;
    }

EDIT 3 split with messages

public DataTable[] splitTable(DataTable mainDT,string columnName,int mod)
    {
        DataTable[] splitDT = new DataTable[11];
        for (int i=0;i<11;i++)
            splitDT[i]=new DataTable();

        int splitINT;
        int tmp=0;

        foreach (DataRow row in mainDT.Rows)
        {              
           splitINT = row[columnName].GetHashCode();
           tmp = splitINT % mod;
           splitDT[tmp].ImportRow(row);
           MessageBox.Show("value:" + row[columnName].ToString() + "splitINT:" + splitINT + "mod:" + mod +
                            " to table:" + tmp);
            MessageBox.Show("" + splitDT[tmp].Rows.Count);
        }

        return splitDT;
    }

回答1:

The ImportRow on a DataTable without schema doesn't produce any result.

public DataTable[] splitTable(DataTable mainDT,string columnName,int mod)
{
    DataTable[] splitDT = new DataTable[11];
    for (int i=0;i<11;i++)
    {
        // Create a datatable with the same structure (schema) of the source table
        splitDT[i] = mainDT.Clone();
    }

    int splitINT;
    int tmp=0;

    foreach (DataRow row in mainDT.Rows)
    {              
       splitINT = row[columnName].GetHashCode();
       tmp = splitINT % mod;
       splitDT[tmp].ImportRow(row);
    }

    return splitDT;
}

This code copies only a column, not the Whole set of columns. Perhaps your code should create a datatable with only the column to copy from.

回答2:

Because your dgw size is 0,0 either set size:

dgw.Size = new Size(100, 100);

or set dock type to fill:

dgw.Dock = System.Windows.Forms.DockStyle.Fill;

回答3:

In both places where you create the new DataGridViews, you have set the data-source - which will allow it to access the rows, but you haven't told it to handle the columns itself. Try setting AutoGenerateColumns to true before you set the DataSource; i.e.

DataGridView dgw = new DataGridView();
TabPage tp = new TabPage();

//data grid view
dgw.AutoGenerateColumns = true; // <====== added this line
dgw.Name = "dgv" + num;
dgw.AutoSize = true;
dgw.Dock = DockStyle.Fill;

// ... some here not shown

dgw.DataSource = dt; 

and:

dgw = new DataGridView();
dgw.AutoGenerateColumns = true; // <====== added this line
dgw.DataSource = left[i];

来源：https://stackoverflow.com/questions/16917046/displaying-multiple-datatable-in-tabcontrol-c-sharp