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DataTable.WriteXml Method (String, XmlWriteMode, Boolean)

Writes the current data, and optionally the schema, for the DataTable using the specified file and XmlWriteMode. To write the schema, set the value for the mode parameter to WriteSchema. To save the data for the table and all its descendants, set the writeHierarchy parameter to true.

Namespace:  System.Data
Assembly:  System.Data (in System.Data.dll)
public void WriteXml(
	string fileName,
	XmlWriteMode mode,
	bool writeHierarchy
)

Parameters

fileName
Type: System.String
The name of the file to which the data will be written.
mode
Type: System.Data.XmlWriteMode
One of the XmlWriteMode values.
writeHierarchy
Type: System.Boolean
If true, write the contents of the current table and all its descendants. If false (the default value), write the data for the current table only.

The WriteXml method provides a way to write either data only, or both data and schema from a DataTable into an XML document, whereas the WriteXmlSchema method writes only the schema. To write both data and schema, use one of the overloads that include the XmlWriteMode parameter, and set its value to WriteSchema.

Note that the same is true for the ReadXml and ReadXmlSchema methods, respectively. To read XML data, or both schema and data into the DataTable, use the ReadXml method. To read just the schema, use the ReadXmlSchema method.

Normally, the WriteXml method saves data only for the current table. If you want to save the data for the current table and all of schema, the WriteXml method provides a way to write either data only, or both data and schema from a DataTable into an XML document, whereas the WriteXmlSchema method writes only the schema. To write both data and schema, use one of the overloads that include the XmlWriteMode parameter, and set its value to WriteSchema.

Note that the same is true for the ReadXml and ReadXmlSchema methods, respectively. To read XML data, or both schema and data into the DataTable, use the ReadXml method. To read just the schema, use the ReadXmlSchema method.

Normally the WriteXml method writes the data only for the current table. To write the data for the current table and all descendant, related tables, call the method with the writeHierarchy parameter set to true.

NoteNote

An InvalidOperationException will be thrown if a column type in the DataRow being read from or written to implements IDynamicMetaObjectProvider and does not implement IXmlSerializable.

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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