// <Snippet1>
public void SearchParameters()
{
// ...
// create OleDbParameterCollection parameters
// ...
if (!parameters.Contains("Description"))
{
Console.WriteLine("ERROR: no such parameter in the collection");
}
else
{
Console.WriteLine("Name: " + parameters["Description"].ToString() +
"Index: " + parameters.IndexOf("Description").ToString());
}
}
public void OleDbParameterCollection_MultipleScenarios_Success()
{
OleDbParameterCollection opc = command.Parameters;
Assert.True(opc.Count == 0);
Assert.False(opc.IsReadOnly);
Assert.False(opc.IsFixedSize);
Assert.False(opc.IsSynchronized);
Assert.Throws <IndexOutOfRangeException>(() => opc[0].ParameterName);
Assert.Throws <IndexOutOfRangeException>(() => opc["@p1"].ParameterName);
Assert.Throws <ArgumentNullException>(() => opc.Add(null));
opc.Add((object)new OleDbParameter());
opc.Add((object)new OleDbParameter());
Collections.IEnumerator enm = opc.GetEnumerator();
Assert.True(enm.MoveNext());
Assert.Equal("Parameter1", ((OleDbParameter)enm.Current).ParameterName);
Assert.True(enm.MoveNext());
Assert.Equal("Parameter2", ((OleDbParameter)enm.Current).ParameterName);
opc.Add(new OleDbParameter(null, null));
opc.Add(null, OleDbType.Integer, 0, null);
Assert.Equal("Parameter4", opc["Parameter4"].ParameterName);
opc.Add(new OleDbParameter("Parameter5", OleDbType.LongVarWChar, 20));
opc.Add(new OleDbParameter(null, OleDbType.WChar, 20, "a"));
opc.RemoveAt(opc[3].ParameterName);
Assert.Equal(-1, opc.IndexOf(null));
Assert.False(opc.Contains(null));
Assert.Throws <IndexOutOfRangeException>(() => opc.RemoveAt(null));
OleDbParameter p = opc[0];
Assert.Throws <ArgumentException>(() => opc.Add((object)p));
Assert.Throws <ArgumentException>(() => new OleDbCommand().Parameters.Add(p));
Assert.Throws <ArgumentNullException>(() => opc.Remove(null));
string pname = p.ParameterName;
p.ParameterName = pname;
p.ParameterName = pname.ToUpper();
p.ParameterName = pname.ToLower();
p.ParameterName = "@p1";
p.ParameterName = pname;
opc.Clear();
opc.Add(p);
opc.Clear();
opc.AddWithValue("@p1", null);
Assert.Equal(-1, opc.IndexOf(p.ParameterName));
opc[0] = p;
Assert.Equal(0, opc.IndexOf(p.ParameterName));
Assert.True(opc.Contains(p.ParameterName));
Assert.True(opc.Contains(opc[0]));
opc[0] = p;
opc[p.ParameterName] = new OleDbParameter(p.ParameterName, null);
opc[p.ParameterName] = (OleDbParameter)OleDbFactory.Instance.CreateParameter();
opc.RemoveAt(0);
new OleDbCommand().Parameters.Clear();
new OleDbCommand().Parameters.CopyTo(new object[0], 0);
Assert.False(new OleDbCommand().Parameters.GetEnumerator().MoveNext());
Assert.Throws <InvalidCastException>(() => new OleDbCommand().Parameters.Add(0));
Assert.Throws <ArgumentNullException>(() => new OleDbCommand().Parameters.AddRange(null));
Assert.Throws <InvalidCastException>(() => new OleDbCommand().Parameters.Insert(0, 0));
Assert.Throws <InvalidCastException>(() => new OleDbCommand().Parameters.Remove(0));
Assert.Throws <ArgumentException>(() => opc.Remove(new OleDbParameter()));
}