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An extension to StringBuilder for ReplaceAt functionality. Given an index, and optional length, and a string to overwrite, this method overwrites an area of characters.
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| namespace System.Text | |
| { | |
| internal static class StringBuilderExtensions | |
| { | |
| #if EXTENSIONS_SUPPORTED | |
| public static StringBuilder ReplaceAt(this StringBuilder sb, string value, int index, int count) | |
| { | |
| return StringBuilderExtensions.ReplaceAt(sb, value, index, count); | |
| } | |
| #endif | |
| public static StringBuilder ReplaceAt(StringBuilder sb, int index, int length, string value) | |
| { | |
| if (string.IsNullOrEmpty(value)) | |
| { | |
| sb.Remove(index, length); | |
| } | |
| else | |
| { | |
| if (index + length > sb.Length) | |
| throw new ArgumentException(string.Format("Given the index of '{0}' and length of '{1}', the replacement area extends beyond the length of the string.", index, length)); | |
| if (value.Length > length) | |
| { | |
| sb.Insert(index, new String('#',value.Length-length)); | |
| } | |
| if (value.Length < length) | |
| { | |
| sb.Remove(index + value.Length, length - value.Length); | |
| } | |
| for (int i = index, j = 0; j < value.Length; i++, j++) | |
| { | |
| sb[i] = value[j]; | |
| } | |
| } | |
| return sb; | |
| } | |
| } | |
| } |
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