| private ReadXml ( XmlReader reader, bool denyResolving ) : XmlReadMode | ||
| reader | XmlReader | |
| denyResolving | bool | |
| return | XmlReadMode | |
internal XmlReadMode ReadXml(XmlReader reader, bool denyResolving)
{
long logScopeId = DataCommonEventSource.Log.EnterScope("<ds.DataTable.ReadXml|INFO> {0}, denyResolving={1}", ObjectID, denyResolving);
try
{
RowDiffIdUsageSection rowDiffIdUsage = new RowDiffIdUsageSection();
try
{
bool fDataFound = false;
bool fSchemaFound = false;
bool fDiffsFound = false;
bool fIsXdr = false;
int iCurrentDepth = -1;
XmlReadMode ret = XmlReadMode.Auto;
// clear the hashtable to avoid conflicts between diffgrams, SqlHotFix 782
rowDiffIdUsage.Prepare(this);
if (reader == null)
{
return ret;
}
bool originalEnforceConstraint = false;
if (DataSet != null)
{
originalEnforceConstraint = DataSet.EnforceConstraints;
DataSet.EnforceConstraints = false;
}
else
{
originalEnforceConstraint = EnforceConstraints;
EnforceConstraints = false;
}
if (reader is XmlTextReader)
{
((XmlTextReader)reader).WhitespaceHandling = WhitespaceHandling.Significant;
}
XmlDocument xdoc = new XmlDocument(); // we may need this to infer the schema
XmlDataLoader xmlload = null;
reader.MoveToContent();
if (Columns.Count == 0)
{
if (IsEmptyXml(reader))
{
reader.Read();
return ret;
}
}
if (reader.NodeType == XmlNodeType.Element)
{
iCurrentDepth = reader.Depth;
if ((reader.LocalName == Keywords.DIFFGRAM) && (reader.NamespaceURI == Keywords.DFFNS))
{
if (Columns.Count == 0)
{
if (reader.IsEmptyElement)
{
reader.Read();
return XmlReadMode.DiffGram;
}
throw ExceptionBuilder.DataTableInferenceNotSupported();
}
ReadXmlDiffgram(reader);
// read the closing tag of the current element
ReadEndElement(reader);
RestoreConstraint(originalEnforceConstraint);
return XmlReadMode.DiffGram;
}
// if reader points to the schema load it
if (reader.LocalName == Keywords.XDR_SCHEMA && reader.NamespaceURI == Keywords.XDRNS)
{
// load XDR schema and exit
ReadXDRSchema(reader);
RestoreConstraint(originalEnforceConstraint);
return XmlReadMode.ReadSchema; //since the top level element is a schema return
}
if (reader.LocalName == Keywords.XSD_SCHEMA && reader.NamespaceURI == Keywords.XSDNS)
{
// load XSD schema and exit
ReadXmlSchema(reader, denyResolving);
RestoreConstraint(originalEnforceConstraint);
return XmlReadMode.ReadSchema; //since the top level element is a schema return
}
if (reader.LocalName == Keywords.XSD_SCHEMA && reader.NamespaceURI.StartsWith(Keywords.XSD_NS_START, StringComparison.Ordinal))
{
if (DataSet != null)
{ // we should not throw for constraint, we already will throw for unsupported schema, so restore enforce cost, but not via property
DataSet.RestoreEnforceConstraints(originalEnforceConstraint);
}
else
{
_enforceConstraints = originalEnforceConstraint;
}
throw ExceptionBuilder.DataSetUnsupportedSchema(Keywords.XSDNS);
}
// now either the top level node is a table and we load it through dataReader...
// ... or backup the top node and all its attributes because we may need to InferSchema
XmlElement topNode = xdoc.CreateElement(reader.Prefix, reader.LocalName, reader.NamespaceURI);
if (reader.HasAttributes)
{
int attrCount = reader.AttributeCount;
for (int i = 0; i < attrCount; i++)
{
reader.MoveToAttribute(i);
if (reader.NamespaceURI.Equals(Keywords.XSD_XMLNS_NS))
{
topNode.SetAttribute(reader.Name, reader.GetAttribute(i));
}
else
{
XmlAttribute attr = topNode.SetAttributeNode(reader.LocalName, reader.NamespaceURI);
attr.Prefix = reader.Prefix;
attr.Value = reader.GetAttribute(i);
}
}
}
reader.Read();
while (MoveToElement(reader, iCurrentDepth))
{
if ((reader.LocalName == Keywords.DIFFGRAM) && (reader.NamespaceURI == Keywords.DFFNS))
{
ReadXmlDiffgram(reader);
// read the closing tag of the current element
ReadEndElement(reader);
RestoreConstraint(originalEnforceConstraint);
return XmlReadMode.DiffGram;
}
// if reader points to the schema load it...
if (!fSchemaFound && !fDataFound && reader.LocalName == Keywords.XDR_SCHEMA && reader.NamespaceURI == Keywords.XDRNS)
{
// load XDR schema and exit
ReadXDRSchema(reader);
fSchemaFound = true;
fIsXdr = true;
continue;
}
if (reader.LocalName == Keywords.XSD_SCHEMA && reader.NamespaceURI == Keywords.XSDNS)
{
// load XSD schema and exit
ReadXmlSchema(reader, denyResolving);
fSchemaFound = true;
continue;
}
if (reader.LocalName == Keywords.XSD_SCHEMA && reader.NamespaceURI.StartsWith(Keywords.XSD_NS_START, StringComparison.Ordinal))
{
if (DataSet != null)
{
// we should not throw for constraint, we already will throw for unsupported schema, so restore enforce cost, but not via property
DataSet.RestoreEnforceConstraints(originalEnforceConstraint);
}
else
{
_enforceConstraints = originalEnforceConstraint;
}
throw ExceptionBuilder.DataSetUnsupportedSchema(Keywords.XSDNS);
}
if ((reader.LocalName == Keywords.DIFFGRAM) && (reader.NamespaceURI == Keywords.DFFNS))
{
ReadXmlDiffgram(reader);
fDiffsFound = true;
ret = XmlReadMode.DiffGram;
}
else
{
// we found data here
fDataFound = true;
if (!fSchemaFound && Columns.Count == 0)
{
XmlNode node = xdoc.ReadNode(reader);
topNode.AppendChild(node);
}
else
{
if (xmlload == null)
{
xmlload = new XmlDataLoader(this, fIsXdr, topNode, false);
}
xmlload.LoadData(reader);
ret = fSchemaFound ? XmlReadMode.ReadSchema : XmlReadMode.IgnoreSchema;
}
}
}
// read the closing tag of the current element
ReadEndElement(reader);
// now top node contains the data part
xdoc.AppendChild(topNode);
if (!fSchemaFound && Columns.Count == 0)
{
if (IsEmptyXml(reader))
{
reader.Read();
return ret;
}
throw ExceptionBuilder.DataTableInferenceNotSupported();
}
if (xmlload == null)
xmlload = new XmlDataLoader(this, fIsXdr, false);
// so we InferSchema
if (!fDiffsFound)
{
// we need to add support for inference here
}
}
RestoreConstraint(originalEnforceConstraint);
return ret;
}
finally
{
rowDiffIdUsage.Cleanup();
}
}
finally
{
DataCommonEventSource.Log.ExitScope(logScopeId);
}
}
| DataTable::ReadXml ( Stream stream ) : XmlReadMode | |
| DataTable::ReadXml ( TextReader reader ) : XmlReadMode | |
| DataTable::ReadXml ( XmlReader reader ) : XmlReadMode | |
| DataTable::ReadXml ( XmlReader reader, XmlReadMode mode, bool denyResolving ) : XmlReadMode | |
| DataTable::ReadXml ( string fileName ) : XmlReadMode |
private void ConfiguracionInicial()
{
// diseño de la TablaPersona
TablaPersona.Columns.Add("usuario");
TablaPersona.Columns.Add("contraseña");
TablaPersona.Columns.Add("email");
TablaPersona.Columns.Add("Materia que se dicta");
// busca si el archivo ya existe para precargar sus datos
if (System.IO.File.Exists(NombreArchivo))
{
TablaPersona.ReadXml(NombreArchivo);
}
else
{
TablaPersona.WriteXml(NombreArchivo);
}
/* asigna TablaPersona a dgvPersonas
dgvPersonas.DataSource = TablaPersona;
// elimina la posibilidad de ingresar datos en el datagridview
dgvPersonas.AllowUserToAddRows = false;
elimina el encabezado de las filas
dgvPersonas.RowHeadersVisible = false; */
}
