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- [Bug] Fix Column more than 255 rows cannot be read error [#208](https://github.com/shps951023/MiniExcel/issues/#208)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,87 @@ | ||
| <Query Kind="Program"> | ||
| <NuGetReference>Dapper</NuGetReference> | ||
| <NuGetReference>MiniExcel</NuGetReference> | ||
| <NuGetReference>Newtonsoft.Json</NuGetReference> | ||
| <NuGetReference>System.Data.SqlClient</NuGetReference> | ||
| <Namespace>Dapper</Namespace> | ||
| <Namespace>MiniExcelLibs</Namespace> | ||
| <Namespace>Newtonsoft.Json</Namespace> | ||
| <RemoveNamespace>System.Data</RemoveNamespace> | ||
| <RemoveNamespace>System.Diagnostics</RemoveNamespace> | ||
| <RemoveNamespace>System.Linq.Expressions</RemoveNamespace> | ||
| <RemoveNamespace>System.Text</RemoveNamespace> | ||
| <RemoveNamespace>System.Text.RegularExpressions</RemoveNamespace> | ||
| <RemoveNamespace>System.Threading</RemoveNamespace> | ||
| <RemoveNamespace>System.Transactions</RemoveNamespace> | ||
| <RemoveNamespace>System.Xml</RemoveNamespace> | ||
| <RemoveNamespace>System.Xml.Linq</RemoveNamespace> | ||
| <RemoveNamespace>System.Xml.XPath</RemoveNamespace> | ||
| </Query> | ||
|
|
||
| void Main() | ||
| { | ||
| Console.WriteLine(Helpers.GetAlphabetColumnName(255)); | ||
| Console.WriteLine(Helpers.GetAlphabetColumnName(256)); | ||
| Console.WriteLine(Helpers.GetAlphabetColumnName(257)); | ||
| Console.WriteLine(Helpers.GetAlphabetColumnName(258)); | ||
| Console.WriteLine(Helpers.GetAlphabetColumnName(16383)); | ||
| //Console.WriteLine(Helpers.GetAlphabetColumnName(16384)); | ||
| var _IntMappingAlphabet = Helpers._IntMappingAlphabet; | ||
| var _AlphabetMappingInt = Helpers._AlphabetMappingInt; | ||
| } | ||
|
|
||
| // You can define other methods, fields, classes and namespaces here | ||
| internal static class Helpers | ||
| { | ||
| private const int GENERAL_COLUMN_INDEX = 255; | ||
| private const int MAX_COLUMN_INDEX = 16383; | ||
|
|
||
| internal static Dictionary<int, string> _IntMappingAlphabet; | ||
| internal static Dictionary<string, int> _AlphabetMappingInt; | ||
| static Helpers() | ||
| { | ||
| if (_IntMappingAlphabet == null && _AlphabetMappingInt == null) | ||
| { | ||
| _IntMappingAlphabet = new Dictionary<int, string>(); | ||
| _AlphabetMappingInt = new Dictionary<string, int>(); | ||
| for (int i = 0; i <= GENERAL_COLUMN_INDEX; i++) | ||
| { | ||
| _IntMappingAlphabet.Add(i, IntToLetters(i)); | ||
| _AlphabetMappingInt.Add(IntToLetters(i), i); | ||
| } | ||
| } | ||
| } | ||
|
|
||
| public static string GetAlphabetColumnName(int columnIndex) | ||
| { | ||
| if (columnIndex >= _IntMappingAlphabet.Count) | ||
| { | ||
| if (columnIndex > MAX_COLUMN_INDEX) | ||
| throw new InvalidDataException($"ColumnIndex {columnIndex} over excel vaild max index."); | ||
| for (int i = _IntMappingAlphabet.Count; i <= columnIndex; i++) | ||
| { | ||
| _IntMappingAlphabet.Add(i, IntToLetters(i)); | ||
| _AlphabetMappingInt.Add(IntToLetters(i), i); | ||
| } | ||
| } | ||
| return _IntMappingAlphabet[columnIndex]; | ||
| } | ||
| public static int GetColumnIndex(string columnName) | ||
| { | ||
| var columnIndex = _AlphabetMappingInt[columnName]; | ||
|
|
||
| return columnIndex; | ||
| } | ||
|
|
||
| internal static string IntToLetters(int value) | ||
| { | ||
| value = value + 1; | ||
| string result = string.Empty; | ||
| while (--value >= 0) | ||
| { | ||
| result = (char)('A' + value % 26) + result; | ||
| value /= 26; | ||
| } | ||
| return result; | ||
| } | ||
| } |
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