// This method reads the attributes of your container class via
// reflection in order to build a schema for the DataTable that you
// will explicitly convert to.
private DataTable ConstructDataTableSchema(T item)
{
string tableName = string.Empty;
List <DTConverterContainer> schemaContainers = new List <DTConverterContainer>();
Type type = item.GetType();
MemberInfo[] members = type.GetProperties();
foreach (MemberInfo member in members)
{
object[] attributes = member.GetCustomAttributes(true);
if (attributes.Length == 0)
{
continue;
}
foreach (object attribute in attributes)
{
ConversionAttribute ca = attribute as ConversionAttribute;
if (ca == null)
{
continue;
}
if (!ca.DataTableConversion)
{
continue;
}
// The name of the container class is used to name
// your DataTable
string[] classNameArray =
member.ReflectedType.ToString().Split(
Convert.ToChar("."));
tableName = classNameArray[classNameArray.Length - 1];
string name = member.Name;
PropertyInfo prop = type.GetProperty(name);
Type valueType = prop.GetValue(item, null).GetType();
// Each property that is will be a column in our
// DataTable.
schemaContainers.Add(new DTConverterContainer(name,
valueType, ca.AllowDBNull, ca.KeyField));
}
}
if (schemaContainers.Count > 0)
{
DataTable dataTable = new DataTable(tableName);
DataColumn[] dataColumn = new DataColumn[schemaContainers.Count];
// Counts the number of keys that will need to be created
int totalNumberofKeys = 0;
foreach (DTConverterContainer container in schemaContainers)
{
if (container.IsKey && m_enforceKeys)
{
totalNumberofKeys = totalNumberofKeys + 1;
}
}
// Builds the DataColumns for our DataTable
DataColumn[] keyColumnArray = new DataColumn[totalNumberofKeys];
int keyColumnIndex = 0;
for (int i = 0; i < schemaContainers.Count; i++)
{
dataColumn[i] = new DataColumn
{
DataType = schemaContainers[i].PropertyType,
ColumnName = schemaContainers[i].PropertyName,
AllowDBNull = schemaContainers[i].AllowDBNull
};
dataTable.Columns.Add(dataColumn[i]);
if (schemaContainers[i].IsKey != true || m_enforceKeys != true)
{
continue;
}
keyColumnArray[keyColumnIndex] = dataColumn[i];
keyColumnIndex = keyColumnIndex + 1;
}
if (m_enforceKeys)
{
dataTable.PrimaryKey = keyColumnArray;
}
return(dataTable);
}
return(null);
}
public DataTable GetDataTable(List <T> items)
{
DataTable dt;
try
{
// Build a table schema from the first element in the collection
dt = ConstructDataTableSchema(items[0]);
}
catch (IndexOutOfRangeException ex)
{
throw (new ApplicationException(
"Cannot convert List of zero length to a DataTable", ex));
}
// If the container is not convertable than throw an
// ApplicationException.
if (dt == null)
{
throw new ApplicationException("List items are not convertable.");
}
// Create a new row for every item in the collection and fill it.
for (int i = 0; i < items.Count; i++)
{
DataRow dr = dt.NewRow();
Type type = items[i].GetType();
MemberInfo[] members = type.GetProperties();
foreach (MemberInfo member in members)
{
object[] attributes = member.GetCustomAttributes(true);
if (attributes.Length == 0)
{
continue;
}
foreach (object attribute in attributes)
{
ConversionAttribute ca = attribute as
ConversionAttribute;
if (ca == null)
{
continue;
}
if (!ca.DataTableConversion)
{
continue;
}
string[] nameArray
= member.Name.Split(
Convert.ToChar(" "));
PropertyInfo prop = type.GetProperty(
nameArray[0]);
// Type valueType = prop.GetValue(items[i],
// null).GetType() // COMMENTED BY CODEIT.RIGHT;
dr[nameArray[0]] = prop.GetValue(items[i], null);
}
}
dt.Rows.Add(dr);
}
return(dt);
}
