我有一个小程序,它接受一个数据表(从sql数据库中获取数据) 然后按字段将其拆分为数据表数组,然后将其显示在tabcontrol中,其中的每个字段都有自己的选项卡
拆分,取单个数据表并拆分成数据表数组,工作正常我认为
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;
}
这是问题部分
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();
}
}
它打开一个tabcontrol,其中包含适量的选项卡,但没有数据
编辑1 仍然不行,显示没有gridview的标签 将其更改为一个函数,该函数可以获取数据表数组的部分
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);
}
编辑2 添加了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 与消息分开
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;
}
答案 0 :(得分:1)
没有架构的DataTable上的ImportRow不会产生任何结果。
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;
}
此代码仅复制列,而不复制整个列集。也许你的代码应该创建一个只有要复制的列的数据表。
答案 1 :(得分:0)
因为您的dgw
大小为0,0,无论是设置大小:
dgw.Size = new Size(100, 100);
或设置码头类型以填充:
dgw.Dock = System.Windows.Forms.DockStyle.Fill;
答案 2 :(得分:0)
在您创建新DataGridView
的两个地方,您都设置了数据源 - 这将允许它访问行,但您还没有告诉它自己处理列。在 设置AutoGenerateColumns
之前,请尝试将true
设置为DataSource
;即。
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;
和
dgw = new DataGridView();
dgw.AutoGenerateColumns = true; // <====== added this line
dgw.DataSource = left[i];