Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / Designer / WebForms / System / Web / UI / Design / DesignTimeDataBinding.cs / 1 / DesignTimeDataBinding.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Web.UI.Design { using System.ComponentModel; using System.Diagnostics; using System.Globalization; using System.Text.RegularExpressions; using System.Web; using System.Web.RegularExpressions; using System.Web.UI; ////// internal sealed class DesignTimeDataBinding { private static readonly Regex EvalRegex = new EvalExpressionRegex(); private static readonly Regex BindExpressionRegex = new BindExpressionRegex(); private static readonly Regex BindParametersRegex = new BindParametersRegex(); private DataBinding _runtimeDataBinding; private bool _parsed; private bool _twoWayBinding; private string _field; private string _format; private string _expression; public DesignTimeDataBinding(DataBinding runtimeDataBinding) { _runtimeDataBinding = runtimeDataBinding; } public DesignTimeDataBinding(PropertyDescriptor propDesc, string expression) { _expression = expression; _runtimeDataBinding = new DataBinding(propDesc.Name, propDesc.PropertyType, expression); } public DesignTimeDataBinding(PropertyDescriptor propDesc, string field, string format, bool twoWayBinding) { _field = field; _format = format; if (twoWayBinding) { _expression = CreateBindExpression(field, format); } else { _expression = CreateEvalExpression(field, format); } _parsed = true; _twoWayBinding = twoWayBinding; _runtimeDataBinding = new DataBinding(propDesc.Name, propDesc.PropertyType, _expression); } public bool IsCustom { get { EnsureParsed(); return (_field == null); } } public string Expression { get { EnsureParsed(); return _expression; } } public string Field { get { EnsureParsed(); Debug.Assert(IsCustom == false); return _field; } } public string Format { get { EnsureParsed(); Debug.Assert(IsCustom == false); return _format; } } public bool IsTwoWayBound { get { EnsureParsed(); return _twoWayBinding; } } public DataBinding RuntimeDataBinding { get { return _runtimeDataBinding; } } public static string CreateBindExpression(string field, string format) { Debug.Assert((field != null) && (field.Length != 0)); string bindFieldName = field; bool hasBrackets = false; for (int i = 0; i < field.Length; i++) { char currentChar = field[i]; if (!Char.IsLetterOrDigit(currentChar) && currentChar != '_') { if (!hasBrackets) { bindFieldName = "[" + field + "]"; hasBrackets = true; } } } if ((format != null) && (format.Length != 0)) { return String.Format(CultureInfo.InvariantCulture, "Bind(\"{0}\", \"{1}\")", bindFieldName, format); } else { return String.Format(CultureInfo.InvariantCulture, "Bind(\"{0}\")", bindFieldName); } } public static string CreateEvalExpression(string field, string format) { Debug.Assert((field != null) && (field.Length != 0)); string evalFieldName = field; bool hasBrackets = false; for (int i = 0; i < field.Length; i++) { char currentChar = field[i]; if (!Char.IsLetterOrDigit(currentChar) && currentChar != '_') { if (!hasBrackets) { evalFieldName = "[" + field + "]"; hasBrackets = true; } } } if ((format != null) && (format.Length != 0)) { return String.Format(CultureInfo.InvariantCulture, "Eval(\"{0}\", \"{1}\")", evalFieldName, format); } else { return String.Format(CultureInfo.InvariantCulture, "Eval(\"{0}\")", evalFieldName); } } private void EnsureParsed() { if (_parsed == false) { _expression = _runtimeDataBinding.Expression.Trim(); if (_expression.Length != 0) { try { bool evalMatch = false; Match match = EvalRegex.Match(_expression); if (match.Success) { evalMatch = true; } else { match = BindExpressionRegex.Match(_expression); } if (match.Success) { string paramString = match.Groups["params"].Value; if ((match = BindParametersRegex.Match(paramString, 0)).Success) { _field = match.Groups["fieldName"].Value; Group formatStringGroup = match.Groups["formatString"]; if (formatStringGroup != null) { _format = formatStringGroup.Value; } if (!evalMatch) { _twoWayBinding = true; } } } } catch (Exception e) { Debug.Fail(e.ToString()); } } } _parsed = true; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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