[英]C# Iterate through rows in a DataTable
我正在嘗試遍歷2列表中的行,以對照名稱檢查每行中的1個字段。 找到后,我想編寫代碼以將相應的Number分配給OurNumber變量,並通過將GotTheNumber設置為true來打破循環。
以下是我正在使用的代碼:
private void BtnDelete_Click(object sender, EventArgs e)// Sends to ConfirmDeleteEMP Form
{
ConfirmDeleteEMP form = new ConfirmDeleteEMP();
DataTable table = new DataTable();
string connstring = @"Provider = Microsoft.ACE.OLEDB.12.0;Data Source=|DataDirectory|\\HoliPlanData.accdb;Persist Security Info=False";
using (OleDbConnection conn = new OleDbConnection(connstring))
{
string query = "SELECT PayrollNo, (FirstName + ' ' + LastName) AS NAME FROM [Employee]";
OleDbDataAdapter adapter = new OleDbDataAdapter(query, conn);
adapter.Fill(table);
}
string SelectedName = DropBoxEmp.Text;
bool GotTheNumber = false;
int OurNumber = 0;
while (!GotTheNumber)
{
foreach (DataRow ThisRow in table.Rows)
{
if (SelectedName = (table.Rows[ThisRow]))
{
OurNumber = ///THATNUMBER///;
GotTheNumber = true;
}
}
}
MessageBox.Show(SelectedName);
var GoodNumber = (table.Rows[OurNumber]["PayrollNo"].ToString());
form.PassValueName = SelectedName;
form.PassSelectedPayroll = GoodNumber;
form.Tag = this;
form.Show(this);
Hide();
}
我不知道從If語句去哪里,所以將不勝感激任何幫助。
遍歷客戶程序中的行確實是您不想要的。 讓數據庫為您完成這項工作。 嘗試這個:
private void BtnDelete_Click(object sender, EventArgs e)// Sends to ConfirmDeleteEMP Form
{
object result;
string query = "SELECT PayrollNo FROM [Employee] WHERE FirstName + ' ' + LastName = ?";
string connstring = @"Provider = Microsoft.ACE.OLEDB.12.0;Data Source=|DataDirectory|\\HoliPlanData.accdb;Persist Security Info=False";
using (OleDbConnection conn = new OleDbConnection(connstring))
using (OleDbCommand cmd = new OleDbCommand(query, conn))
{
//guessing at type and length here
cmd.Parameters.Add("?", OleDbType.VarWChar, 50).Value = DropBoxEmp.Text;
conn.Open();
result = cmd.ExecuteScalar();
}
if (result != null && result != DBNull.Value)
{
ConfirmDeleteEMP form = new ConfirmDeleteEMP();
form.PassValueName = DropBoxEmp.Text;
form.PassSelectedPayroll = (int)result;
form.Tag = this;
form.Show(this);
Hide();
}
}
如果您確實想在所有原因下遍歷行(速度較慢,需要編寫更多代碼,並且更容易出錯),則可以執行以下操作:
private void BtnDelete_Click(object sender, EventArgs e)// Sends to ConfirmDeleteEMP Form
{
DataTable table = new DataTable();
string query = "SELECT PayrollNo, (FirstName + ' ' + LastName) AS NAME FROM [Employee]";
string connstring = @"Provider = Microsoft.ACE.OLEDB.12.0;Data Source=|DataDirectory|\\HoliPlanData.accdb;Persist Security Info=False";
using (OleDbConnection conn = new OleDbConnection(connstring))
{
OleDbDataAdapter adapter = new OleDbDataAdapter(query, conn);
adapter.Fill(table);
}
int PayrollNumber = 0;
foreach (DataRow ThisRow in table.Rows)
{
if (DropBoxEmp.Text == ThisRow["NAME"])
{
PayrollNumber = (int)ThisRow["PayrollNo"];
break;
}
}
//the whole loop could also be consolidated to this:
//PayrollNumber = (int)table.Rows.First(r => r["NAME"] == DropBoxEmp.Text)["PayrollNo"];
ConfirmDeleteEMP form = new ConfirmDeleteEMP();
form.PassValueName = DropBoxEmp.Text;
form.PassSelectedPayroll = PayrollNumber ;
form.Tag = this;
form.Show(this);
Hide();
}
嗯,很難猜出你到底是什么問題。 但是我認為您只想從當前行中獲取PayrollNo,不是嗎?
關於進一步下降的線...
var GoodNumber = (table.Rows[OurNumber]["PayrollNo"].ToString());
...我想您可以致電:
if (...)
{
OurNumber = ThisRow["PayrollNo"].ToString();
GotTheNumber = true;
}
但是 ,我不知道您如何使用以下if條件以及是否確實滿足您的要求:
if (SelectedName = (table.Rows[ThisRow]))
{
...
}
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.