Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / Data / System / Data / Filter / ConstNode.cs / 1 / ConstNode.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //[....] //[....] //[....] //----------------------------------------------------------------------------- namespace System.Data { using System; using System.Diagnostics; using System.Collections.Generic; using System.ComponentModel; using System.Globalization; internal sealed class ConstNode : ExpressionNode { internal readonly object val; internal ConstNode(DataTable table, ValueType type, object constant) : this(table, type, constant, true) { } internal ConstNode(DataTable table, ValueType type, object constant, bool fParseQuotes) : base(table) { switch (type) { case ValueType.Null: this.val = DBNull.Value; break; case ValueType.Numeric: this.val = SmallestNumeric(constant); break; case ValueType.Decimal: this.val = SmallestDecimal(constant); break; case ValueType.Float: this.val = Convert.ToDouble(constant, NumberFormatInfo.InvariantInfo); break; case ValueType.Bool: this.val = Convert.ToBoolean(constant, CultureInfo.InvariantCulture); break; case ValueType.Str: if (fParseQuotes) { // replace '' with one ' this.val = ((string)constant).Replace("''", "'"); } else { this.val = (string)constant; } break; case ValueType.Date: this.val = DateTime.Parse((string)constant, CultureInfo.InvariantCulture); break; case ValueType.Object: this.val = constant; break; default: Debug.Assert(false, "NYI"); goto case ValueType.Object; } } internal override void Bind(DataTable table, Listlist) { BindTable(table); } internal override object Eval() { return val; } internal override object Eval(DataRow row, DataRowVersion version) { return Eval(); } internal override object Eval(int[] recordNos) { return Eval(); } internal override bool IsConstant() { return true; } internal override bool IsTableConstant() { return true; } internal override bool HasLocalAggregate() { return false; } internal override bool HasRemoteAggregate() { return false; } internal override ExpressionNode Optimize() { return this; } private object SmallestDecimal(object constant) { if (null == constant) { return 0d; } else { string sval = (constant as string); if (null != sval) { decimal r12; if (Decimal.TryParse(sval, NumberStyles.Number, NumberFormatInfo.InvariantInfo, out r12)) { return r12; } double r8; if (Double.TryParse(sval, NumberStyles.Float| NumberStyles.AllowThousands, NumberFormatInfo.InvariantInfo, out r8)) { return r8; } } else { IConvertible convertible = (constant as IConvertible); if (null != convertible) { try { return convertible.ToDecimal(NumberFormatInfo.InvariantInfo); } catch (System.ArgumentException e) { ExceptionBuilder.TraceExceptionWithoutRethrow(e); } catch (System.FormatException e) { ExceptionBuilder.TraceExceptionWithoutRethrow(e); } catch (System.InvalidCastException e) { ExceptionBuilder.TraceExceptionWithoutRethrow(e); } catch (System.OverflowException e) { ExceptionBuilder.TraceExceptionWithoutRethrow(e); } try { return convertible.ToDouble(NumberFormatInfo.InvariantInfo); } catch (System.ArgumentException e) { ExceptionBuilder.TraceExceptionWithoutRethrow(e); } catch (System.FormatException e) { ExceptionBuilder.TraceExceptionWithoutRethrow(e); } catch (System.InvalidCastException e) { ExceptionBuilder.TraceExceptionWithoutRethrow(e); } catch (System.OverflowException e) { ExceptionBuilder.TraceExceptionWithoutRethrow(e); } } } } return constant; } private object SmallestNumeric(object constant) { if (null == constant) { return (int)0; } else { string sval = (constant as string); if (null != sval) { int i4; if (Int32.TryParse(sval, NumberStyles.Integer, NumberFormatInfo.InvariantInfo, out i4)) { return i4; } long i8; if (Int64.TryParse(sval, NumberStyles.Integer, NumberFormatInfo.InvariantInfo, out i8)) { return i8; } double r8; if (Double.TryParse(sval, NumberStyles.Float| NumberStyles.AllowThousands, NumberFormatInfo.InvariantInfo, out r8)) { return r8; } } else { IConvertible convertible = (constant as IConvertible); if (null != convertible) { try { return convertible.ToInt32(NumberFormatInfo.InvariantInfo); } catch (System.ArgumentException e) { ExceptionBuilder.TraceExceptionWithoutRethrow(e); } catch (System.FormatException e) { ExceptionBuilder.TraceExceptionWithoutRethrow(e); } catch (System.InvalidCastException e) { ExceptionBuilder.TraceExceptionWithoutRethrow(e); } catch (System.OverflowException e) { ExceptionBuilder.TraceExceptionWithoutRethrow(e); } try { return convertible.ToInt64(NumberFormatInfo.InvariantInfo); } catch (System.ArgumentException e) { ExceptionBuilder.TraceExceptionWithoutRethrow(e); } catch (System.FormatException e) { ExceptionBuilder.TraceExceptionWithoutRethrow(e); } catch (System.InvalidCastException e) { ExceptionBuilder.TraceExceptionWithoutRethrow(e); } catch (System.OverflowException e) { ExceptionBuilder.TraceExceptionWithoutRethrow(e); } try { return convertible.ToDouble(NumberFormatInfo.InvariantInfo); } catch (System.ArgumentException e) { ExceptionBuilder.TraceExceptionWithoutRethrow(e); } catch (System.FormatException e) { ExceptionBuilder.TraceExceptionWithoutRethrow(e); } catch (System.InvalidCastException e) { ExceptionBuilder.TraceExceptionWithoutRethrow(e); } catch (System.OverflowException e) { ExceptionBuilder.TraceExceptionWithoutRethrow(e); } } } } return constant; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. 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