Imported Upstream version 5.4.0.167

Former-commit-id: 5624ac747d633e885131e8349322922b6a59baaa

mcs/class/referencesource/System.Web.DataVisualization/Common/Utilities/ValueConverter.cs

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+//-------------------------------------------------------------
+// <copyright company=<3D>Microsoft Corporation<6F>>
+//   Copyright <20> Microsoft Corporation. All Rights Reserved.
+// </copyright>
+//-------------------------------------------------------------
+// @owner=alexgor, deliant
+//=================================================================
+//  File:		ValueConverter.cs
+//
+//  Namespace:	System.Web.UI.WebControls[Windows.Forms].Charting.Utilities
+//
+//	Classes:	ValueConverter
+//
+//  Purpose:	Helper class which converts DateTime or numeric 
+//              values to string. It used to display data point
+//              values as labels, tooltips and axis labels.
+//
+//	Reviewed:	AG - August 7, 2002
+//              AG - Microsoft 5, 2007
+//
+//===================================================================
+
+
+#region Used Namespaces
+
+using System;
+using System.Globalization;
+
+#if Microsoft_CONTROL
+	using System.Windows.Forms.DataVisualization.Charting;
+#else
+	using System.Web.UI.DataVisualization.Charting;
+#endif
+
+#endregion
+
+#if Microsoft_CONTROL
+	namespace System.Windows.Forms.DataVisualization.Charting.Utilities
+#else
+	namespace System.Web.UI.DataVisualization.Charting.Utilities
+#endif
+{
+	/// <summary>
+    /// ValueConverter class is used when numeric or DateTime 
+    /// value needs to be converted to a string using specified format.
+	/// </summary>
+	internal static class ValueConverter
+	{
+		#region Methods
+
+        /// <summary>
+        /// Converts value to string using specified format.
+        /// </summary>
+        /// <param name="chart">Reference to the chart object.</param>
+        /// <param name="obj">Reference to the object being formatted.</param>
+        /// <param name="objTag">Additional object tag.</param>
+        /// <param name="value">Value converted to string.</param>
+        /// <param name="format">Format string.</param>
+        /// <param name="valueType">Value type.</param>
+        /// <param name="elementType">Chart element type being formatted.</param>
+		public static string FormatValue(
+			Chart chart,
+			object obj,
+            object objTag,
+			double value, 
+			string format, 
+			ChartValueType valueType,
+			ChartElementType elementType)
+		{
+            format = format ?? String.Empty;
+            string	convertionFormat = format;
+			string	result = "";
+
+			// Make sure value index is part of the format
+			if(convertionFormat != null && convertionFormat.Length > 0)
+			{
+				int	bracketIndex = convertionFormat.IndexOf('{', 0);
+				if(bracketIndex >= 0)
+				{
+					while(bracketIndex >= 0)
+					{
+						// If format is not followed by the value index
+						if(!convertionFormat.Substring(bracketIndex).StartsWith("{0:", StringComparison.Ordinal))
+						{
+							// Check charcter prior to the bracket
+							if(bracketIndex >= 1 && convertionFormat.Substring(bracketIndex - 1, 1) == "{")
+							{
+								continue;
+							}
+							else
+							{
+								// Insert value index in format
+								convertionFormat = convertionFormat.Insert(bracketIndex + 1, "0:");
+							}
+						}
+
+						bracketIndex = convertionFormat.IndexOf('{', bracketIndex + 1);
+					}
+				}
+				else
+				{
+					convertionFormat = "{0:" + convertionFormat + "}";
+				}
+			}
+
+			// Date/time formating
+            if (valueType == ChartValueType.DateTime || 
+                valueType == ChartValueType.DateTimeOffset || 
+                valueType == ChartValueType.Date)
+			{
+				// Set default format
+				if(convertionFormat.Length == 0)
+				{
+					convertionFormat = "{0:d}";
+                    if (valueType == ChartValueType.DateTimeOffset)
+                        convertionFormat += " +0";
+				}
+
+				// Convert date to string
+                result = String.Format(CultureInfo.CurrentCulture, convertionFormat, DateTime.FromOADate(value));
+			}
+			else if(valueType == ChartValueType.Time)
+			{
+				// Set default format
+				if(convertionFormat.Length == 0)
+				{
+					convertionFormat = "{0:t}";
+				}
+
+				// Convert date to string
+                result = String.Format(CultureInfo.CurrentCulture, convertionFormat, DateTime.FromOADate(value));
+			}
+			else
+			{
+				bool	failedFlag = false;
+
+				// Set default format
+				if(convertionFormat.Length == 0)
+				{
+					convertionFormat = "{0:G}";
+				}
+
+				try
+				{
+					// Numeric value formatting
+                    result = String.Format(CultureInfo.CurrentCulture,convertionFormat, value);
+				}
+				catch(FormatException)
+				{
+					failedFlag = true;
+				}
+
+				// If numeric formatting failed try to format using decimal number
+				if(failedFlag)
+				{
+					failedFlag = false;
+                    try
+                    {
+                        // Decimal value formatting
+                        result = String.Format(CultureInfo.CurrentCulture, convertionFormat, (long)value);
+                    }
+                    catch (ArgumentNullException)
+                    {
+                        failedFlag = true;
+                    }
+                    catch (FormatException)
+                    {
+                        failedFlag = true;
+                    }
+				}
+
+				// Return format string as result (literal) if all formatting methods failed
+				if(failedFlag)
+				{
+                    result = format;
+				}
+			}
+
+            // For the Reporting Services chart a special number formatting
+            // handler may be set and used for all formatting needs.
+            if (chart != null)
+            {
+                // Call number formatter
+                FormatNumberEventArgs eventArguments = new FormatNumberEventArgs(value, format, valueType, result, objTag, elementType);
+                chart.CallOnFormatNumber(obj, eventArguments);
+                result = eventArguments.LocalizedValue;
+            }
+
+			return result;
+		}
+	
+		#endregion
+	}
+}