public void Remove()
{
DataTable table = new DataTable("test_table");
DataColumnCollection cols = table.Columns;
cols.Add("test");
cols.Add("test2");
cols.Add("test3");
cols.Add("test4");
Assert.Equal(4, cols.Count);
cols.Remove("test2");
Assert.Equal(3, cols.Count);
cols.Remove("TEST3");
Assert.Equal(2, cols.Count);
// Column '_test_' does not belong to table test_table.
Assert.Throws <ArgumentException>(() => cols.Remove("_test_"));
cols.Add();
cols.Add();
cols.Add();
cols.Add();
Assert.Equal(6, cols.Count);
cols.Remove(cols[0]);
cols.Remove(cols[0]);
Assert.Equal(4, cols.Count);
Assert.Equal("Column1", cols[0].ColumnName);
// Cannot remove a column that doesn't belong to this table.
Assert.Throws <ArgumentException>(() => cols.Remove(new DataColumn("Column10")));
cols.Add();
cols.Add();
cols.Add();
cols.Add();
Assert.Equal(8, cols.Count);
cols.RemoveAt(7);
cols.RemoveAt(1);
cols.RemoveAt(0);
cols.RemoveAt(0);
Assert.Equal(4, cols.Count);
Assert.Equal("Column4", cols[0].ColumnName);
Assert.Equal("Column5", cols[1].ColumnName);
// Cannot find column 10.
Assert.Throws <IndexOutOfRangeException>(() => cols.RemoveAt(10));
}
[Test] // Add (String)
public void Add3_ColumnName_Null()
{
DataTable table = new DataTable();
DataColumnCollection cols = table.Columns;
DataColumn col;
col = cols.Add((string)null);
Assert.AreEqual(1, cols.Count, "#A1");
Assert.AreEqual("Column1", col.ColumnName, "#A2");
Assert.AreSame(table, col.Table, "#A3");
col = cols.Add((string)null);
Assert.AreEqual(2, cols.Count, "#B1");
Assert.AreEqual("Column2", col.ColumnName, "#B2");
Assert.AreSame(table, col.Table, "#B3");
cols.RemoveAt(1);
col = cols.Add((string)null);
Assert.AreEqual(2, cols.Count, "#C1");
Assert.AreEqual("Column2", col.ColumnName, "#C2");
Assert.AreSame(table, col.Table, "#C3");
cols.Clear();
col = cols.Add((string)null);
Assert.AreEqual(1, cols.Count, "#D1");
Assert.AreEqual("Column1", col.ColumnName, "#D2");
Assert.AreSame(table, col.Table, "#D3");
}
[Fact] // Add (String)
public void Add3_ColumnName_Null()
{
DataTable table = new DataTable();
DataColumnCollection cols = table.Columns;
DataColumn col;
col = cols.Add((string)null);
Assert.Equal(1, cols.Count);
Assert.Equal("Column1", col.ColumnName);
Assert.Same(table, col.Table);
col = cols.Add((string)null);
Assert.Equal(2, cols.Count);
Assert.Equal("Column2", col.ColumnName);
Assert.Same(table, col.Table);
cols.RemoveAt(1);
col = cols.Add((string)null);
Assert.Equal(2, cols.Count);
Assert.Equal("Column2", col.ColumnName);
Assert.Same(table, col.Table);
cols.Clear();
col = cols.Add((string)null);
Assert.Equal(1, cols.Count);
Assert.Equal("Column1", col.ColumnName);
Assert.Same(table, col.Table);
}
private void _btnDel_Click(object sender, System.EventArgs e)
{
DataColumnCollection c = _dt.Columns;
var lastindex = c.Count - 1;
if (lastindex > -1)
{
c.RemoveAt(lastindex);
}
}
public DataColumnCollection getColumnsWithoutIdentity()
{
DataColumnCollection columns = model.getColumns();
DataColumn identityColumn = getIdentityColumn();
for (int i = 0; i < columns.Count; ++i)
{
if (columns[i].ColumnName == identityColumn.ColumnName)
{
columns.RemoveAt(i);
}
}
return(columns);
}
public void Remove()
{
DataTable Table = new DataTable("test_table");
DataColumnCollection Cols = Table.Columns;
Cols.Add("test");
Cols.Add("test2");
Cols.Add("test3");
Cols.Add("test4");
Assert.Equal(4, Cols.Count);
Cols.Remove("test2");
Assert.Equal(3, Cols.Count);
Cols.Remove("TEST3");
Assert.Equal(2, Cols.Count);
try
{
Cols.Remove("_test_");
Assert.False(true);
}
catch (Exception e)
{
Assert.Equal(typeof(ArgumentException), e.GetType());
// Never premise English.
//Assert.Equal ("Column '_test_' does not belong to table test_table.", e.Message);
}
Cols.Add();
Cols.Add();
Cols.Add();
Cols.Add();
Assert.Equal(6, Cols.Count);
Cols.Remove(Cols[0]);
Cols.Remove(Cols[0]);
Assert.Equal(4, Cols.Count);
Assert.Equal("Column1", Cols[0].ColumnName);
try
{
Cols.Remove(new DataColumn("Column10"));
Assert.False(true);
}
catch (Exception e)
{
Assert.Equal(typeof(ArgumentException), e.GetType());
// Never premise English.
//Assert.Equal ("Cannot remove a column that doesn't belong to this table.", e.Message);
}
Cols.Add();
Cols.Add();
Cols.Add();
Cols.Add();
Assert.Equal(8, Cols.Count);
Cols.RemoveAt(7);
Cols.RemoveAt(1);
Cols.RemoveAt(0);
Cols.RemoveAt(0);
Assert.Equal(4, Cols.Count);
Assert.Equal("Column4", Cols[0].ColumnName);
Assert.Equal("Column5", Cols[1].ColumnName);
try
{
Cols.RemoveAt(10);
Assert.False(true);
}
catch (Exception e)
{
Assert.Equal(typeof(IndexOutOfRangeException), e.GetType());
// Never premise English.
//Assert.Equal ("Cannot find column 10.", e.Message);
}
}
public void RemoveAt(int index)
{
_columns.RemoveAt(index);
}
/// <summary>
/// This sub removes the column specified by the given index from the collection.
/// </summary>
/// <param name="Index">Index of <see cref=" DASDataColumn "></see> object to be removed.</param>
public void RemoveAt(int Index)
{
m_Columns.RemoveAt(Index);
}
public void RemoveAt(int index)
{
_collection.RemoveAt(index);
}