private static void CopyToRow(BaseTypedDictionary dictionary, DataRow row)
{
foreach (KeyValuePair <string, object> kvp in dictionary)
{
DataColumn col = row.Table.Columns[kvp.Key];
if ((col != null) && !col.ReadOnly && !col.AutoIncrement)
{
row[col] = kvp.Value;
}
}
}
private static DataRow FindRow(BaseTypedDictionary row, DataTable table)
{
DataColumn[] tableKeys = table.PrimaryKey;
object[] rowKeys = new object[tableKeys.Length];
for (int i = 0; i < tableKeys.Length; i++)
{
DataColumn tableKey = tableKeys[i];
string keyName = tableKey.ColumnName;
rowKeys[i] = row[keyName];
}
return(table.Rows.Find(rowKeys));
}
/// <summary>
/// Invokes a method on an object by dynamically constructing its argument list.
/// </summary>
/// <param name="method">The method to invoke.</param>
/// <param name="target">The target of the method invocation.</param>
/// <param name="parameter">An object or IDictionary that describes the method parameters.</param>
/// <returns>The return value of the method.</returns>
private static object InvokeMethod(MethodInfo method, object target, object parameter)
{
ParameterInfo[] targetMethodParameters = method.GetParameters();
object[] parameterValues = new object[targetMethodParameters.Length];
if (targetMethodParameters.Length > 0)
{
if (parameter == null)
{
throw new ArgumentNullException("parameter");
}
if (targetMethodParameters.Length == 1)
{
Type parameterType = targetMethodParameters[0].ParameterType;
if (parameterType.IsAssignableFrom(parameter.GetType()))
{
// 1. There is one destination parameter whose type is directly compatible with the parameter we have
parameterValues[0] = parameter;
}
else
{
// Create a dictionary from the parameter
BaseTypedDictionary parameterDictionary = GetDictionary(parameter, targetMethodParameters);
object value;
if (parameterDictionary.TryGetValue(targetMethodParameters[0].Name, out value))
{
// 2. There is one destination parameter whose name exists in our parameter dictionary
parameterValues[0] = value;
}
else
{
// 3. There is one destination parameter with a complex type of which we must reconstruct
// an instance from the dictionary
// Construct the instance
object parameterValue = Activator.CreateInstance(parameterType);
// Copy property values from dictionary entries
// DataService does NOT support fields because DataObjectFieldAttribute
// can't be applied to fields.
// DataService implementations that use the attributes won't be able to use fields
// and implementations that don't won't use InvokeMethod.
foreach (KeyValuePair <string, object> entry in parameterDictionary)
{
PropertyInfo propertyInfo = GetPropertyInfo(parameterType, entry.Key);
if (propertyInfo != null && propertyInfo.CanWrite)
{
propertyInfo.SetValue(parameterValue, entry.Value, null);
}
}
parameterValues[0] = parameterValue;
}
}
}
else
{
// 4. There are multiple simple type parameters that we copy from the parameter dictionary
BaseTypedDictionary parameterDictionary = GetDictionary(parameter, targetMethodParameters);
for (int i = 0; i < targetMethodParameters.Length; i++)
{
ParameterInfo parameterInfo = targetMethodParameters[i];
object value;
if (parameterDictionary.TryGetValue(parameterInfo.Name, out value))
{
parameterValues[i] = value;
}
else
{
throw new InvalidOperationException();
}
}
}
}
return(method.Invoke(target, parameterValues));
}
protected virtual DataTable SaveDataImplementation(ChangeList changeList, object parameters, string loadMethod)
{
if ((_adapter != null) && (_updateMethod != null))
{
DataTable dataTable = GetData(parameters, loadMethod);
foreach (object rowToDelete in changeList.Deleted)
{
FindRow(GetDictionary(rowToDelete, dataTable.Columns), dataTable).Delete();
}
foreach (object rowToUpdate in changeList.Updated)
{
BaseTypedDictionary rowDict = GetDictionary(rowToUpdate, dataTable.Columns);
DataRow tableRow = FindRow(rowDict, dataTable);
CopyToRow(rowDict, tableRow);
}
foreach (object rowToInsert in changeList.Inserted)
{
DataRow newRow = dataTable.NewRow();
dataTable.Rows.Add(newRow);
BaseTypedDictionary rowDict = GetDictionary(rowToInsert, dataTable.Columns);
CopyToRow(rowDict, newRow);
}
_updateMethod.Invoke(_adapter, new object[] { dataTable });
return(dataTable);
}
else
{
MethodInfo deleteMethod = GetDataMethod(DataObjectMethodType.Delete);
MethodInfo updateMethod = GetDataMethod(DataObjectMethodType.Update);
MethodInfo insertMethod = GetDataMethod(DataObjectMethodType.Insert);
if (deleteMethod != null)
{
foreach (object rowToDelete in changeList.Deleted)
{
InvokeMethod(deleteMethod, this, rowToDelete);
}
}
else if (changeList.Deleted.Length != 0)
{
throw new InvalidOperationException("The Data Service must implement one method marked with the DataObjectMethod(DataObjectMethodType.Delete) attribute to handle deleted rows.");
}
if (updateMethod != null)
{
foreach (object rowToUpdate in changeList.Updated)
{
InvokeMethod(updateMethod, this, rowToUpdate);
}
}
else if (changeList.Updated.Length != 0)
{
throw new InvalidOperationException("The Data Service must implement one method marked with the DataObjectMethod(DataObjectMethodType.Update) attribute to handle updated rows.");
}
if (insertMethod != null)
{
foreach (object rowToInsert in changeList.Inserted)
{
InvokeMethod(insertMethod, this, rowToInsert);
}
}
else if (changeList.Inserted.Length != 0)
{
throw new InvalidOperationException("The Data Service must implement one method marked with the DataObjectMethod(DataObjectMethodType.Insert) attribute to handle inserted rows.");
}
return(GetData(parameters, loadMethod));
}
}