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[英]C# datagridview set databound column value to a chosen default one
[英]column count property cannot be set on a databound datagridview control c#
在我的表单中,我有一个 DataGridView。 并控制输入和输出数据。 在网格视图中显示数据时。 我在两次调用 BindGrid 。 一个是formload,另一个是在添加新记录之后。
public formAccounts()
{
InitializeComponent();
BindGrid();
}
private void BindGrid()
{
OleDbConnection conn = new OleDbConnection();
conn.ConnectionString = @"Provider=Microsoft.Jet.OLEDB.4.0;Data Source= G:\Sanjeev\TESTDB\DB.mdb;Jet OLEDB:Database Password=Test123; Jet OLEDB:Engine Type=5";
conn.Open();
string constring = @"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=G:\Sanjeev\TESTDB\DB.mdb;Jet OLEDB:Database Password=Test123; Jet OLEDB:Engine Type=5";
using (OleDbConnection con = new OleDbConnection(constring))
{
using (OleDbCommand cmd = new OleDbCommand("SELECT * FROM tblAccounts", con))
{
cmd.CommandType = CommandType.Text;
using (OleDbDataAdapter sda = new OleDbDataAdapter(cmd))
{
using (DataTable dt = new DataTable())
{
sda.Fill(dt);
//Set AutoGenerateColumns False
dtGrdAccounts.AutoGenerateColumns = false;
//Set Columns Count
***dtGrdAccounts.ColumnCount = 3;***
//Add Columns
dtGrdAccounts.Columns[0].Name = "AccountID";
dtGrdAccounts.Columns[0].HeaderText = "Id";
dtGrdAccounts.Columns[0].DataPropertyName = "AccID";
dtGrdAccounts.Columns[1].HeaderText = "Account name";
dtGrdAccounts.Columns[1].Name = "Account name";
dtGrdAccounts.Columns[1].DataPropertyName = "AccName";
dtGrdAccounts.Columns[2].Name = "AccountNumber";
dtGrdAccounts.Columns[2].HeaderText = "Account number";
dtGrdAccounts.Columns[2].DataPropertyName = "AccNumber";
dtGrdAccounts.DataSource = dt;
}
}
}
}
}
如果我删除行dtGrdAccounts.ColumnCount = 3;
我得到低于错误。 Index was out of range. Must be non-negative and less than the size of the collection. Parameter name: index
添加新记录后,在按钮保存时,我调用 BindGrid() 方法以获取 GridiView 中的记录。
string cmdText = "prAddAccounts";
OleDbCommand cmd = new OleDbCommand(cmdText, conn);
cmd.CommandType = CommandType.StoredProcedure;
cmd.Parameters.AddWithValue("AccName", txtAccName.Text.ToString());
//..... other parameters to insert record .....
OleDbCommand cmd = new OleDbCommand(cmdText, conn);
cmd.CommandType = CommandType.StoredProcedure;
OleDbDataReader reader = cmd.ExecuteReader();
BindGrid();
问题是当您再次调用BindGrid()
时,您必须先清除它:
string cmdText = "prAddAccounts";
OleDbCommand cmd = new OleDbCommand(cmdText, conn);
cmd.CommandType = CommandType.StoredProcedure;
cmd.Parameters.AddWithValue("AccName", txtAccName.Text.ToString());
//..... other parameters to insert record .....
//Clear the binding.
dtGrdAccounts.DataSource = null;
//Bind the new data.
BindGrid();
如果您在设置列属性之前多次调用 datagridview 列设计代码,则必须将 Gridview 数据源设置为 null,如下所示
dataGridView1.DataSource = null;
using (DataTable dt = new DataTable())
{
//add this line of code
dtGrdAccounts.DataSource = null;
sda.Fill(dt);
//Set AutoGenerateColumns False
dtGrdAccounts.AutoGenerateColumns = false;
//Set Columns Count
***dtGrdAccounts.ColumnCount = 3;***
//Add Columns
dtGrdAccounts.Columns[0].Name = "AccountID";
dtGrdAccounts.Columns[0].HeaderText = "Id";
dtGrdAccounts.Columns[0].DataPropertyName = "AccID";
dtGrdAccounts.Columns[1].HeaderText = "Account name";
dtGrdAccounts.Columns[1].Name = "Account name";
dtGrdAccounts.Columns[1].DataPropertyName = "AccName";
dtGrdAccounts.Columns[2].Name = "AccountNumber";
dtGrdAccounts.Columns[2].HeaderText = "Account number";
dtGrdAccounts.Columns[2].DataPropertyName = "AccNumber";
dtGrdAccounts.DataSource = dt;
}
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