ViewStateの文字列からViewStateのオブジェクトを生成する using System; using System.Collections; using System.Text; using System.IO; using System.Web.UI; namespace ViewStateArticle.ExtendedPageClasses { /// <summary> /// Parses the view state, constructing a viaully-accessible object graph. /// </summary> public class ViewStateParser { // private member variables private TextWriter tw; private string indentString = " "; #region Constructor /// <summary> /// Creates a new ViewStateParser instance, specifying the TextWriter to emit the output to. /// </summary> public ViewStateParser(TextWriter writer) { tw = writer; } #endregion #region Methods #region ParseViewStateGraph Methods /// <summary> /// Emits a readable version of the view state to the TextWriter passed into the object's constructor. /// </summary> /// <param name="viewState">The view state object to start parsing at.</param> public virtual void ParseViewStateGraph(object viewState) { ParseViewStateGraph(viewState, 0, string.Empty); } /// <summary> /// Emits a readable version of the view state to the TextWriter passed into the object's constructor. /// </summary> /// <param name="viewStateAsString">A base-64 encoded representation of the view state to parse.</param> public virtual void ParseViewStateGraph(string viewStateAsString) { // First, deserialize the string into a Triplet LosFormatter los = new LosFormatter(); object viewState = los.Deserialize(viewStateAsString); ParseViewStateGraph(viewState, 0, string.Empty); } /// <summary> /// Recursively parses the view state. /// </summary> /// <param name="node">The current view state node.</param> /// <param name="depth">The "depth" of the view state tree.</param> /// <param name="label">A label to display in the emitted output next to the current node.</param> protected virtual void ParseViewStateGraph(object node, int depth, string label) { tw.Write(System.Environment.NewLine); if (node == null) { tw.Write(String.Concat(Indent(depth), label, "NODE IS NULL")); } else if (node is Triplet) { tw.Write(String.Concat(Indent(depth), label, "TRIPLET")); ParseViewStateGraph(((Triplet) node).First, depth+1, "First: "); ParseViewStateGraph(((Triplet) node).Second, depth+1, "Second: "); ParseViewStateGraph(((Triplet) node).Third, depth+1, "Third: "); } else if (node is Pair) { tw.Write(String.Concat(Indent(depth), label, "PAIR")); ParseViewStateGraph(((Pair) node).First, depth+1, "First: "); ParseViewStateGraph(((Pair) node).Second, depth+1, "Second: "); } else if (node is ArrayList) { tw.Write(String.Concat(Indent(depth), label, "ARRAYLIST")); // display array values for (int i = 0; i < ((ArrayList) node).Count; i++) ParseViewStateGraph(((ArrayList) node)[i], depth+1, String.Format("({0}) ", i)); } else if (node.GetType().IsArray) { tw.Write(String.Concat(Indent(depth), label, "ARRAY ")); tw.Write(String.Concat("(", node.GetType().ToString(), ")")); IEnumerator e = ((Array) node).GetEnumerator(); int count = 0; while (e.MoveNext()) ParseViewStateGraph(e.Current, depth+1, String.Format("({0}) ", count++)); } else if (node.GetType().IsPrimitive || node is string) { tw.Write(String.Concat(Indent(depth), label)); tw.Write(node.ToString() + " (" + node.GetType().ToString() + ")"); } else { tw.Write(String.Concat(Indent(depth), label, "OTHER - ")); tw.Write(node.GetType().ToString()); } } #endregion /// <summary> /// Returns a string containing the <see cref="IndentString"/> property value a specified number of times. /// </summary> /// <param name="depth">The number of times to repeat the <see cref="IndentString"/> property.</param> /// <returns>A string containing the <see cref="IndentString"/> property value a specified number of times.</returns> protected virtual string Indent(int depth) { StringBuilder sb = new StringBuilder(IndentString.Length * depth); for (int i = 0; i < depth; i++) sb.Append(IndentString); return sb.ToString(); } #endregion #region Properties /// <summary> /// Specifies the indentation to use for each level when displaying the object graph. /// </summary> /// <value>A string value; the default is three blank spaces.</value> public string IndentString { get { return indentString; } set { indentString = value; } } #endregion } } 本当にほしかったのはこういうブログだったんだ コメント: |