如何查看类库中某个类的具体实现过程的源代码?"转到定义"只能看到这些
恳请前辈指教!万分感激!
--------------------编程问答--------------------
选中类库，点 F1也看不到代码，不过详细点，偶尔还有例子 --------------------编程问答--------------------
--------------------编程问答--------------------
//
// System.Data.SqlClient.SqlCommandBuilder.cs
//
// Author:
// Tim Coleman (tim@timcoleman.com)
//
// Copyright (C) Tim Coleman, 2002
// (C) 2005 Mainsoft Corporation (http://www.mainsoft.com)
//
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Data.Common;
using System.Text;
using System.Data.ProviderBase;
namespace System.Data.SqlClient {
public sealed class SqlCommandBuilder : AbstractDbCommandBuilder
{
#region Fields
bool disposed = false;
DataTable dbSchemaTable;
SqlDataAdapter adapter;
string quotePrefix;
string quoteSuffix;
string[] columnNames;
string tableName;
SqlCommand deleteCommand;
SqlCommand insertCommand;
SqlCommand updateCommand;
// Used to construct WHERE clauses
static readonly string clause1 = "({0} IS NULL AND {1} IS NULL)";
static readonly string clause2 = "({0} = {1})";
#endregion // Fields
#region Constructors
public SqlCommandBuilder ()
{
dbSchemaTable = null;
adapter = null;
quoteSuffix = String.Empty;
quotePrefix = String.Empty;
}
public SqlCommandBuilder (SqlDataAdapter adapter)
: this ()
{
DataAdapter = adapter;
}
#endregion // Constructors
#region Properties
[DataSysDescription ("The DataAdapter for which to automatically generate SqlCommands")]
[DefaultValue (null)]
public SqlDataAdapter DataAdapter {
get { return adapter; }
set {
adapter = value;
if (adapter != null)
adapter.RowUpdating += new SqlRowUpdatingEventHandler (RowUpdatingHandler);
}
}
private string QuotedTableName {
get { return GetQuotedString (tableName); }
}
[Browsable (false)]
[DataSysDescription ("The character used in a text command as the opening quote for quoting identifiers that contain special characters.")]
[DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
public string QuotePrefix {
get { return quotePrefix; }
set {
if (dbSchemaTable != null)
throw new InvalidOperationException ("The QuotePrefix and QuoteSuffix properties cannot be changed once an Insert, Update, or Delete command has been generated.");
quotePrefix = value;
}
}
[Browsable (false)]
[DataSysDescription ("The character used in a text command as the closing quote for quoting identifiers that contain special characters.")]
[DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
public string QuoteSuffix {
get { return quoteSuffix; }
set {
if (dbSchemaTable != null)
throw new InvalidOperationException ("The QuotePrefix and QuoteSuffix properties cannot be changed once an Insert, Update, or Delete command has been generated.");
quoteSuffix = value;
}
}
private SqlCommand SourceCommand {
get {
if (adapter != null)
return adapter.SelectCommand;
return null;
}
}
#endregion // Properties
#region Methods
private void BuildCache (bool closeConnection)
{
SqlCommand sourceCommand = SourceCommand;
if (sourceCommand == null)
throw new InvalidOperationException ("The DataAdapter.SelectCommand property needs to be initialized.");
SqlConnection connection = sourceCommand.Connection;
if (connection == null)
throw new InvalidOperationException ("The DataAdapter.SelectCommand.Connection property needs to be initialized.");
if (dbSchemaTable == null) {
if (connection.State == ConnectionState.Open)
closeConnection = false;
else
connection.Open ();
SqlDataReader reader = (SqlDataReader)sourceCommand.ExecuteReader (CommandBehavior.SchemaOnly | CommandBehavior.KeyInfo);
dbSchemaTable = reader.GetSchemaTable ();
reader.Close ();
if (closeConnection)
connection.Close ();
BuildInformation (dbSchemaTable);
}
}
private void BuildInformation (DataTable schemaTable)
{
tableName = String.Empty;
foreach (DataRow schemaRow in schemaTable.Rows) {
if (tableName == String.Empty)
tableName = (string) schemaRow ["BaseTableName"];
if (tableName != (string) schemaRow["BaseTableName"])
throw new InvalidOperationException ("Dynamic SQL generation is not supported against multiple base tables.");
}
dbSchemaTable = schemaTable;
}
private SqlCommand CreateDeleteCommand (DataRow row, DataTableMapping tableMapping)
{
// If no table was found, then we can't do an delete
if (QuotedTableName == String.Empty)
return null;
CreateNewCommand (ref deleteCommand);
string command = String.Format ("DELETE FROM {0} ", QuotedTableName);
StringBuilder columns = new StringBuilder ();
StringBuilder whereClause = new StringBuilder ();
string dsColumnName = String.Empty;
bool keyFound = false;
int parmIndex = 1;
foreach (DataRow schemaRow in dbSchemaTable.Rows) {
if (!IncludedInWhereClause (schemaRow))
continue;
if (whereClause.Length > 0)
whereClause.Append (" AND ");
bool isKey = (bool) schemaRow ["IsKey"];
SqlParameter parameter = null;
if (!isKey) {
parameter = deleteCommand.Parameters.Add (CreateParameter (parmIndex++, schemaRow));
dsColumnName = tableMapping.ColumnMappings [parameter.SourceColumn].DataSetColumn;
if (row != null)
parameter.Value = row [dsColumnName, DataRowVersion.Current];
whereClause.Append ("(");
whereClause.Append (String.Format (clause1, GetQuotedString (parameter.SourceColumn), parameter.ParameterName));
whereClause.Append (" OR ");
}
else
keyFound = true;
parameter = deleteCommand.Parameters.Add (CreateParameter (parmIndex++, schemaRow));
dsColumnName = tableMapping.ColumnMappings [parameter.SourceColumn].DataSetColumn;
if (row != null)
parameter.Value = row [dsColumnName, DataRowVersion.Current];
whereClause.Append (String.Format (clause2, GetQuotedString (parameter.SourceColumn), parameter.ParameterName));
if (!isKey)
whereClause.Append (")");
}
if (!keyFound)
throw new InvalidOperationException ("Dynamic SQL generation for the DeleteCommand is not supported against a SelectCommand that does not return any key column information.");
// We're all done, so bring it on home
string sql = String.Format ("{0} WHERE ( {1} )", command, whereClause.ToString ());
deleteCommand.CommandText = sql;
return deleteCommand;
}
private SqlCommand CreateInsertCommand (DataRow row, DataTableMapping tableMapping)
{
if (QuotedTableName == String.Empty)
return null;
CreateNewCommand (ref insertCommand);
string command = String.Format ("INSERT INTO {0}", QuotedTableName);
string sql;
StringBuilder columns = new StringBuilder ();
StringBuilder values = new StringBuilder ();
string dsColumnName = String.Empty;
int parmIndex = 1;
foreach (DataRow schemaRow in dbSchemaTable.Rows) {
if (!IncludedInInsert (schemaRow))
continue;
if (parmIndex > 1) {
columns.Append (" , ");
values.Append (" , ");
}
SqlParameter parameter = insertCommand.Parameters.Add (CreateParameter (parmIndex++, schemaRow));
dsColumnName = tableMapping.ColumnMappings [parameter.SourceColumn].DataSetColumn;
if (row != null)
parameter.Value = row [dsColumnName];
columns.Append (GetQuotedString (parameter.SourceColumn));
values.Append (parameter.ParameterName);
}
sql = String.Format ("{0}( {1} ) VALUES ( {2} )", command, columns.ToString (), values.ToString ());
insertCommand.CommandText = sql;
return insertCommand;
}
private void CreateNewCommand (ref SqlCommand command)
{
SqlCommand sourceCommand = SourceCommand;
if (command == null) {
command = sourceCommand.Connection.CreateCommand ();
command.CommandTimeout = sourceCommand.CommandTimeout;
command.Transaction = sourceCommand.Transaction;
}
command.CommandType = CommandType.Text;
command.UpdatedRowSource = UpdateRowSource.None;
}
--------------------编程问答--------------------
private SqlCommand CreateUpdateCommand (DataRow row, DataTableMapping tableMapping)
{
// If no table was found, then we can't do an update
if (QuotedTableName == String.Empty)
return null;
CreateNewCommand (ref updateCommand);
string command = String.Format ("UPDATE {0} SET ", QuotedTableName);
StringBuilder columns = new StringBuilder ();
StringBuilder whereClause = new StringBuilder ();
int parmIndex = 1;
string dsColumnName = String.Empty;
bool keyFound = false;
// First, create the X=Y list for UPDATE
foreach (DataRow schemaRow in dbSchemaTable.Rows) {
if (columns.Length > 0)
columns.Append (" , ");
SqlParameter parameter = updateCommand.Parameters.Add (CreateParameter (parmIndex++, schemaRow));
dsColumnName = tableMapping.ColumnMappings [parameter.SourceColumn].DataSetColumn;
if (row != null)
parameter.Value = row [dsColumnName, DataRowVersion.Proposed];
columns.Append (String.Format ("{0} = {1}", GetQuotedString (parameter.SourceColumn), parameter.ParameterName));
}
// Now, create the WHERE clause. This may be optimizable, but it would be ugly to incorporate
// into the loop above. "Premature optimization is the root of all evil." -- Knuth
foreach (DataRow schemaRow in dbSchemaTable.Rows) {
if (!IncludedInWhereClause (schemaRow))
continue;
if (whereClause.Length > 0)
whereClause.Append (" AND ");
bool isKey = (bool) schemaRow ["IsKey"];
SqlParameter parameter = null;
if (!isKey) {
parameter = updateCommand.Parameters.Add (CreateParameter (parmIndex++, schemaRow));
dsColumnName = tableMapping.ColumnMappings [parameter.SourceColumn].DataSetColumn;
if (row != null)
parameter.Value = row [dsColumnName];
whereClause.Append ("(");
whereClause.Append (String.Format (clause1, GetQuotedString (parameter.SourceColumn), parameter.ParameterName));
whereClause.Append (" OR ");
}
else
keyFound = true;
parameter = updateCommand.Parameters.Add (CreateParameter (parmIndex++, schemaRow));
dsColumnName = tableMapping.ColumnMappings [parameter.SourceColumn].DataSetColumn;
if (row != null)
parameter.Value = row [dsColumnName];
whereClause.Append (String.Format (clause2, GetQuotedString (parameter.SourceColumn), parameter.ParameterName));
if (!isKey)
whereClause.Append (")");
}
if (!keyFound)
throw new InvalidOperationException ("Dynamic SQL generation for the UpdateCommand is not supported against a SelectCommand that does not return any key column information.");
// We're all done, so bring it on home
string sql = String.Format ("{0}{1} WHERE ( {2} )", command, columns.ToString (), whereClause.ToString ());
updateCommand.CommandText = sql;
return updateCommand;
}
private SqlParameter CreateParameter (int parmIndex, DataRow schemaRow)
{
string name = String.Format ("@p{0}", parmIndex);
string sourceColumn = (string) schemaRow ["BaseColumnName"];
SqlDbType sqlDbType = (SqlDbType) schemaRow ["ProviderType"];
int size = (int) schemaRow ["ColumnSize"];
return new SqlParameter (name, sqlDbType, size, sourceColumn);
}
public static void DeriveParameters (SqlCommand command)
{
DeriveParameters((AbstractDbCommand)command);
}
protected override void Dispose (bool disposing)
{
if (!disposed) {
if (disposing) {
if (insertCommand != null)
insertCommand.Dispose ();
if (deleteCommand != null)
deleteCommand.Dispose ();
if (updateCommand != null)
updateCommand.Dispose ();
if (dbSchemaTable != null)
dbSchemaTable.Dispose ();
}
disposed = true;
}
}
public SqlCommand GetDeleteCommand ()
{
BuildCache (true);
return CreateDeleteCommand (null, null);
}
public SqlCommand GetInsertCommand ()
{
BuildCache (true);
return CreateInsertCommand (null, null);
}
private string GetQuotedString (string value)
{
if (value == String.Empty || value == null)
return value;
if (quotePrefix == String.Empty && quoteSuffix == String.Empty)
return value;
return String.Format ("{0}{1}{2}", quotePrefix, value, quoteSuffix);
}
public SqlCommand GetUpdateCommand ()
{
BuildCache (true);
return CreateUpdateCommand (null, null);
}
private bool IncludedInInsert (DataRow schemaRow)
{
// If the parameter has one of these properties, then we don't include it in the insert:
// AutoIncrement, Hidden, Expression, RowVersion, ReadOnly
if ((bool) schemaRow ["IsAutoIncrement"])
return false;
if ((bool) schemaRow ["IsHidden"])
return false;
if ((bool) schemaRow ["IsExpression"])
return false;
if ((bool) schemaRow ["IsRowVersion"])
return false;
if ((bool) schemaRow ["IsReadOnly"])
return false;
return true;
}
private bool IncludedInUpdate (DataRow schemaRow)
{
// If the parameter has one of these properties, then we don't include it in the insert:
// AutoIncrement, Hidden, RowVersion
if ((bool) schemaRow ["IsAutoIncrement"])
return false;
if ((bool) schemaRow ["IsHidden"])
return false;
if ((bool) schemaRow ["IsRowVersion"])
return false;
return true;
}
private bool IncludedInWhereClause (DataRow schemaRow)
{
if ((bool) schemaRow ["IsLong"])
return false;
return true;
}
[MonoTODO ("Figure out what else needs to be cleaned up when we refresh.")]
public void RefreshSchema ()
{
tableName = String.Empty;
dbSchemaTable = null;
}
#endregion // Methods
#region Event Handlers
private void RowUpdatingHandler (object sender, SqlRowUpdatingEventArgs e)
{
if (e.Status != UpdateStatus.Continue)
return;
switch (e.StatementType) {
case StatementType.Delete:
deleteCommand = e.Command;
break;
case StatementType.Insert:
insertCommand = e.Command;
break;
case StatementType.Update:
updateCommand = e.Command;
break;
default:
return;
}
try {
BuildCache (false);
switch (e.StatementType) {
case StatementType.Delete:
e.Command = CreateDeleteCommand (e.Row, e.TableMapping);
e.Status = UpdateStatus.Continue;
break;
case StatementType.Insert:
e.Command = CreateInsertCommand (e.Row, e.TableMapping);
e.Status = UpdateStatus.Continue;
break;
case StatementType.Update:
e.Command = CreateUpdateCommand (e.Row, e.TableMapping);
e.Status = UpdateStatus.Continue;
break;
}
if (e.Command != null && e.Row != null) {
e.Row.AcceptChanges ();
e.Status = UpdateStatus.SkipCurrentRow;
}
}
catch (Exception exception) {
e.Errors = exception;
e.Status = UpdateStatus.ErrorsOccurred;
}
}
#endregion // Event Handlers
}
}
太感谢了!怎么做到的? --------------------编程问答-------------------- 送你个地址
http://www.koders.com/csharp/fid1E1C7E9ED592B1A64B15CE55349DFB0B06656D88.aspx --------------------编程问答--------------------
谢谢你了!
补充：.NET技术 , C#
