简单的 CSV 文件解析库

落日映苍穹つ 2022-05-19 04:58 212阅读 0赞

直接上代码，最后附下载地址。

using System;
    using System.Collections.Generic;
    using System.IO;
    using System.Runtime.InteropServices;
    
    namespace Frame.Data
    {
        /// <summary>
        /// 数据表
        /// </summary>
        public class CSVTable
        {
            private List<CSVTitle> _titles;
            private List<CSVRow> _rows;
    
            public CSVTable()
            {
                _titles = new List<CSVTitle>();
                _rows = new List<CSVRow>();
            }
    
            internal void AddRow(CSVRow row)
            {
                _rows.Add(row);
            }
    
            internal void AddTitle(CSVTitle title)
            {
                _titles.Add(title);
            }
    
            /// <summary>
            /// 设置列数据类型
            /// </summary>
            /// <param name="titleName"></param>
            /// <param name="type"></param>
            public void SetColumnType(string titleName, DataType type)
            {
                CSVTitle title = FindTitle(titleName);
                if (title == null)
                    return;
    
                title.dataType = type;
            }
    
            /// <summary>
            /// 获取列数据类型
            /// </summary>
            /// <param name="titleName"></param>
            /// <returns></returns>
            public DataType GetColumnType(string titleName)
            {
                CSVTitle title = FindTitle(titleName);
                if (title == null)
                    throw (new Exception(string.Format("Can not find column with title:{0}", titleName)));
    
                return title.dataType;
            }
    
            /// <summary>
            /// 获取行数
            /// </summary>
            /// <returns></returns>
            public int GetRowCount()
            {
                return _rows.Count;
            }
    
            /// <summary>
            /// 获取列数
            /// </summary>
            /// <returns></returns>
            public int GetColunmCount()
            {
                return _titles.Count;
            }
    
            /// <summary>
            /// 根据标题名称，获取标题列索引
            /// </summary>
            /// <param name="titleName"></param>
            /// <returns></returns>
            private int FindTitleIndex(string titleName)
            {
                for (int i = 0; i < _titles.Count; i++)
                {
                    if (_titles[i] == null)
                        continue;
    
                    if (_titles[i].IsMatchTitle(titleName))
                        return i;
                }
    
                return -1;
            }
    
            /// <summary>
            /// 查找指定名称列标题
            /// </summary>
            /// <param name="titleName"></param>
            /// <returns></returns>
            public CSVTitle FindTitle(string titleName)
            {
                int titleIndex = FindTitleIndex(titleName);
                if (titleIndex < 0)
                    return null;
    
                return FindTitle(titleIndex);
            }
    
            /// <summary>
            /// 查找指定列索引的标题
            /// </summary>
            /// <param name="titleIndex"></param>
            /// <returns></returns>
            public CSVTitle FindTitle(int titleIndex)
            {
                if (titleIndex < 0 || titleIndex >= _titles.Count)
                    return null;
    
                return _titles[titleIndex];
            }
    
            /// <summary>
            /// 查找指定名称的列标题，并返回列索引
            /// </summary>
            /// <param name="titleName"></param>
            /// <param name="title"></param>
            /// <returns></returns>
            public int FindTitle(string titleName, out CSVTitle title)
            {
                for (int i = 0; i < _titles.Count; i++)
                {
                    if (_titles[i] == null)
                        continue;
    
                    if (_titles[i].IsMatchTitle(titleName))
                    {
                        title = _titles[i];
                        return i;
                    }
                }
    
                title = null;
                return -1;
            }
    
    
            /// <summary>
            /// 获取指定行号的数据行
            /// </summary>
            /// <param name="rowIndex"></param>
            /// <returns></returns>
            public CSVRow FindRow(int rowIndex)
            {
                if (rowIndex < 0 || rowIndex >= _rows.Count)
                    return null;
                return _rows[rowIndex];
            }
    
            /// <summary>
            /// 查找所有满足条件的数据行
            /// </summary>
            /// <param name="predicate"></param>
            /// <returns></returns>
            public List<CSVRow> FindRows(Predicate<CSVRow> predicate)
            {
                return _rows.FindAll(predicate);
            }
    
            /// <summary>
            /// 查找第一个满足条件的数据行
            /// </summary>
            /// <param name="predicate"></param>
            /// <returns></returns>
            public CSVRow FindFirstRow(Predicate<CSVRow> predicate)
            {
                return _rows.Find(predicate);
            }
    
            /// <summary>
            /// 查找最后一个满足条件的数据行
            /// </summary>
            /// <param name="predicate"></param>
            /// <returns></returns>
            public CSVRow FindLastRow(Predicate<CSVRow> predicate)
            {
                return _rows.FindLast(predicate);
            }
    
            /// <summary>
            /// 根据指定主键，查找满足条件的数据行
            /// </summary>
            /// <param name="keyTitle"></param>
            /// <param name="match"></param>
            /// <returns></returns>
            public List<CSVRow> FindRowsByPK(string keyTitle, Predicate<CSVEntry> match)
            {
                return FindRows((CSVRow row) =>
                {
                    var keyEntry = row.GetEntry(keyTitle);
                    return keyEntry != null && match(keyEntry);
                });
            }
        }
    
        /// <summary>
        /// 数据行
        /// </summary>
        public class CSVRow
        {
            //行元素
            private List<CSVEntry> _rowElements;
    
            //所在表格
            private CSVTable _container;
    
            public CSVRow() : this(null, null) { }
            public CSVRow(CSVTable table, IEnumerable<CSVEntry> entries)
            {
                _rowElements = new List<CSVEntry>(entries);
                _container = table;
            }
    
            /// <summary>
            /// 获取指定索引的单元
            /// </summary>
            /// <param name="index"></param>
            /// <returns></returns>
            public CSVEntry GetEntry(int index)
            {
                if (index < 0 || index >= _rowElements.Count)
                    return null;
    
                return _rowElements[index];
            }
    
            /// <summary>
            /// 获取单元个数
            /// </summary>
            /// <returns></returns>
            public int GetElementCount()
            {
                return _rowElements.Count;
            }
    
            /// <summary>
            /// 获取指定标题的单元
            /// </summary>
            /// <param name="titleName"></param>
            /// <returns></returns>
            public CSVEntry GetEntry(string titleName)
            {
                if (string.IsNullOrEmpty(titleName))
                    return null;
    
                CSVTitle title_ = null;
                int titleIndex_ = _container.FindTitle(titleName, out title_);
                if (title_ == null)
                    return null;
    
                return GetEntry(titleIndex_);
            }
        }
    
        /// <summary>
        /// 数据单元
        /// </summary>
        public class CSVEntry
        {
            [StructLayout(LayoutKind.Explicit)]
            private struct NumberHolder
            {
                [FieldOffset(0)]
                public int intValue;
    
                [FieldOffset(0)]
                public float floatValue;
    
                [FieldOffset(0)]
                public bool boolValue;
            }
    
            //单元文本信息
            private string _content;
    
            //行号
            private int _rowIndex;
    
            //列号
            private int _columnIndex;
    
            //所在表格
            private CSVTable _container;
    
            //缓存数字类型值
            private NumberHolder? _numberHolder;
    
            //缓存标题
            private CSVTitle _title;
    
            public string content { get { return _content; } }
            public int rowIndex { get { return _rowIndex; } }
            public int columnIndex { get { return _columnIndex; } }
            public CSVTable container { get { return _container; } }
    
            public CSVEntry(string content, int rowIndex, int colIndex, CSVTable table)
            {
                _content = content;
                _rowIndex = rowIndex;
                _columnIndex = colIndex;
                _container = table;
            }
    
            private CSVTitle FindTitleCache()
            {
                if (_title == null || _title._columnIndex != _columnIndex)
                    _title = _container.FindTitle(_columnIndex);
    
                return _title;
            }
    
            private void CheckAndCache()
            {
                var title_ = FindTitleCache();
                switch (title_.dataType)
                {
                    case DataType.Integer:
                        _numberHolder = new NumberHolder()
                        {
                            intValue = Convert.ToInt32(content)
                        };
                        break;
                    case DataType.Float:
                        _numberHolder = new NumberHolder()
                        {
                            floatValue = Convert.ToSingle(content)
                        };
                        break;
                    case DataType.Bool:
                        _numberHolder = new NumberHolder()
                        {
                            boolValue = Convert.ToBoolean(content)
                        };
                        break;
                    default:
                        break;
                }
            }
    
            public static explicit operator int (CSVEntry entry)
            {
                entry.CheckAndCache();
                if (entry._title.dataType != DataType.Integer &&
                    entry._title.dataType != DataType.Unknown)
                    throw (new InvalidCastException(string.Format("Can not cast entry to {0}", DataType.Integer.ToString())));
    
                return entry._numberHolder.Value.intValue;
            }
    
            public static explicit operator bool (CSVEntry entry)
            {
                entry.CheckAndCache();
                if (entry._title.dataType != DataType.Bool &&
                    entry._title.dataType != DataType.Unknown)
                    throw (new InvalidCastException(string.Format("Can not cast entry to {0}", DataType.Bool.ToString())));
    
                return entry._numberHolder.Value.boolValue;
            }
    
            public static explicit operator string (CSVEntry entry)
            {
                return entry.content;
            }
    
            public static explicit operator float (CSVEntry entry)
            {
                entry.CheckAndCache();
                if (entry._title.dataType != DataType.Float &&
                    entry._title.dataType != DataType.Unknown)
                    throw (new InvalidCastException(string.Format("Can not cast entry to {0}", DataType.Float.ToString())));
    
                return entry._numberHolder.Value.floatValue;
            }
        }
    
        /// <summary>
        /// 数据头信息,它包括了对应列数据的信息，包括标题名称、数据类型等信息
        /// </summary>
        public class CSVTitle : CSVEntry
        {
            //数据类型
            private DataType _dataType;
    
            //列标题
            private string _title;
    
            /// <summary>
            /// 列标题名称
            /// </summary>
            public string title
            {
                get
                {
                    return _title;
                }
            }
    
            /// <summary>
            /// 列数据类型
            /// </summary>
            public DataType dataType
            {
                get
                {
                    return _dataType;
                }
                set
                {
                    _dataType = value;
                }
            }
    
            public CSVTitle(string content, int rowIndex, int colIndex, CSVTable table, DataType type)
                : base(content, rowIndex, colIndex, table)
            {
                _dataType = type;
                _title = GetTitle();
            }
    
            protected virtual string GetTitle()
            {
                return content;
            }
    
            public virtual bool IsMatchTitle(string titleName)
            {
                return title.Equals(titleName, StringComparison.InvariantCulture);
            }
        }
    
        public enum DataType
        {
            /// <summary>
            /// 未指定
            /// </summary>
            Unknown = 0,
    
            /// <summary>
            /// 文本
            /// </summary>
            Text,
    
            /// <summary>
            /// 整形数据
            /// </summary>
            Integer,
    
            /// <summary>
            /// 浮点型
            /// </summary>
            Float,
    
            /// <summary>
            /// 布尔型
            /// </summary>
            Bool,
    
            /// <summary>
            /// 数据类型，形式：item1 | item2 | item3
            /// </summary>
            Array,
    
            /// <summary>
            /// 字典类型，key:value | key:value | key:value
            /// </summary>
            Dictionary,
        }
    
        public static class DataTypeName
        {
            const string INTGER = "int";
            const string FLOAT = "float";
            const string BOOL = "bool";
            const string TEXT = "text";
            const string ARRAY = "array";
            const string DICTIONARY = "map";
    
            public static DataType ConvertToDateType(string typeInf)
            {
                if (typeInf.StartsWith(INTGER, StringComparison.InvariantCultureIgnoreCase))
                    return DataType.Integer;
                else if (typeInf.StartsWith(FLOAT, StringComparison.InvariantCultureIgnoreCase))
                    return DataType.Float;
                else if (typeInf.StartsWith(BOOL, StringComparison.InvariantCultureIgnoreCase))
                    return DataType.Bool;
                else if (typeInf.StartsWith(TEXT, StringComparison.InvariantCultureIgnoreCase))
                    return DataType.Text;
                else if (typeInf.StartsWith(ARRAY, StringComparison.InvariantCultureIgnoreCase))
                    return DataType.Array;
                else if (typeInf.StartsWith(DICTIONARY, StringComparison.InvariantCultureIgnoreCase))
                    return DataType.Dictionary;
                else
                    return DataType.Unknown;
            }
        }
    
        /// <summary>
        /// CSV解析接口
        /// </summary>
        public interface ICSVResolver
        {
            void Resolve(string content);
            CSVTable GetTable();
        }
    
        /// <summary>
        /// 简单csv文件解析器
        /// csv格式：第一行为表头信息，从第二行开始为数据
        /// </summary>
        public class SimpleResolver : ICSVResolver
        {
            protected CSVTable _table;
    
            public const char COMMA = ',';
    
            /// <summary>
            /// 数据行起始索引值
            /// </summary>
            protected int _dataBodyBeginIndex = 1;
    
            public virtual void Resolve(string content)
            {
                _table = new CSVTable();
    
                using (StringReader sr = new StringReader(content))
                {
                    //解析标题行
                    ResolveTitle(sr);
    
                    //数据行
                    ResolveData(sr);
                }
            }
    
            /// <summary>
            /// 解析表头信息
            /// </summary>
            /// <param name="sr"></param>
            protected virtual void ResolveTitle(StringReader sr)
            {
                string titleLine_ = sr.ReadLine();
                string[] titles = titleLine_.Split(COMMA);
                for (int i = 0; i < titles.Length; i++)
                {
                    CSVTitle title = new CSVTitle(titles[i], 0, i, _table, DataType.Unknown);
                    _table.AddTitle(title);
                }
            }
    
            /// <summary>
            /// 解析表数据体
            /// </summary>
            /// <param name="sr"></param>
            protected virtual void ResolveData(StringReader sr)
            {
                string dataLine_ = sr.ReadLine();
                int rowIndex = _dataBodyBeginIndex;
                while (dataLine_ != null)
                {
                    List<CSVEntry> dataEntries = new List<CSVEntry>();
                    string[] dataCells = dataLine_.Split(COMMA);
                    for (int i = 0; i < dataCells.Length; i++)
                    {
                        dataEntries.Add(new CSVEntry(dataCells[i], rowIndex, i, _table));
                    }
    
                    _table.AddRow(new CSVRow(_table, dataEntries));
    
                    rowIndex++;
                    dataLine_ = sr.ReadLine();
                }
            }
    
            public CSVTable GetTable()
            {
                return _table;
            }
        }
    
        /// <summary>
        /// 解析带数据类型的csv解析器
        /// csv格式：第一行为表头信息，第二行为列数据类型
        /// </summary>
        public class ResolverWithType : SimpleResolver
        {
            public ResolverWithType()
            {
                //设置数据起始索引为2
                _dataBodyBeginIndex = 2;
            }
    
            protected override void ResolveTitle(StringReader sr)
            {
                base.ResolveTitle(sr);
    
                string typeLine = sr.ReadLine();
                string[] typeCells = typeLine.Split(COMMA);
                for (int i = 0; i < typeCells.Length; i++)
                {
                    var title = _table.FindTitle(i);
                    title.dataType = DataTypeName.ConvertToDateType(typeCells[i].Trim());
                }
            }
        }
    
        public class CSVReader
        {
    
            ICSVResolver _csvResolver;
    
            public CSVReader() : this(null) { }
            public CSVReader(ICSVResolver resolver)
            {
                if (resolver == null)
                    _csvResolver = new SimpleResolver();
                else
                    _csvResolver = resolver;
            }
    
            public CSVTable LoadTable(string content)
            {
                if (string.IsNullOrEmpty(content))
                    return null;
    
                _csvResolver.Resolve(content);
    
                return _csvResolver.GetTable();
            }
        }
    }

下载地址 和 使用示例：[CSVReader][]

原文地址：[https://blog.csdn.net/salvare/article/details/80516606][https_blog.csdn.net_salvare_article_details_80516606]

[CSVReader]: https://github.com/huosk/CSVReader
[https_blog.csdn.net_salvare_article_details_80516606]: https://blog.csdn.net/salvare/article/details/80516606