datasetconverter.cs

来自「AJAX开发工具包」· CS 代码 · 共 110 行

using System;
using System.Text;
using System.Data;

namespace AjaxPro
{
	/// <summary>
	/// Provides methods to serialize and deserialize a DataSet object.
	/// </summary>
	public class DataSetConverter : IJavaScriptConverter
	{
		private string clientType = "Ajax.Web.DataSet";

		public DataSetConverter() : base()
		{
		}

		public override string GetClientScript()
		{
			return @"addNamespace(""Ajax.Web"");

Ajax.Web.DataSet = function(tables) {
	this.__type = ""System.Data.DataSet, System.Data"";
	this.Tables = new Array();

	this.addTable = function(table) {
		this.Tables.push(table);
	}

	if(tables != null) {
		for(var i=0; i<tables.length; i++) {
			this.addTable(tables[i]);
		}
	}
}

";
		}

		public override object Deserialize(IJavaScriptObject o, Type t)
		{
			if(!(o is JavaScriptObject))
				throw new NotSupportedException();

			JavaScriptObject ht = (JavaScriptObject)o;

			if(!ht.Contains("Tables") || !(ht["Tables"] is JavaScriptArray))
				throw new NotSupportedException();

			JavaScriptArray tables = (JavaScriptArray)ht["Tables"];
			
			DataSet ds = new DataSet();
			DataTable dt = null;

			foreach(IJavaScriptObject table in tables)
			{
				dt = (DataTable)JavaScriptDeserializer.Deserialize(table, typeof(DataTable));

				if(dt != null)
					ds.Tables.Add(dt);
			}

			return ds;			
		}

		public override string Serialize(object o)
		{
			if(!(o is DataSet))
				throw new NotSupportedException();
			
			StringBuilder sb = new StringBuilder();
			DataSet ds = (DataSet)o;
			bool b = true;

			sb.Append("new ");
			sb.Append(clientType);
			sb.Append("([");
				
			foreach(DataTable dt in ds.Tables)
			{
				if(b){ b = false; }
				else{ sb.Append(","); }

				sb.Append(JavaScriptSerializer.Serialize(dt));
			}

			sb.Append("])");

			return sb.ToString();
		}

		public override Type[] SerializableTypes
		{
			get
			{
				return new Type[]{typeof(DataSet)};
			}
		}

		public override Type[] DeserializableTypes
		{
			get
			{
				return new Type[]{typeof(DataSet)};
			}
		}

	}
}