#region

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

#endregion

namespace CSFrameworkV5.Common
{
    /// <summary>
    ///     将资料表(DataTable)已修改的资料行数据去左右空格、全角转半角
    /// </summary>
    public sealed class FieldFitString
    {
        /// <summary>
        ///     将资料表中已修改的资料行数据去左右空格、全角转半角
        /// </summary>
        /// <param name="dt"></param>
        public static void FitString(DataTable dt)
        {
            //仅处理已修改的资料行
            foreach (DataRow dr in dt.Rows)
                if (dr.RowState == DataRowState.Added ||
                    dr.RowState == DataRowState.Modified)
                    foreach (DataColumn C in dt.Columns)
                        if (C.DataType == Type.GetType("System.String"))
                            dr[C.ColumnName] =
                                RemoveChar(
                                    ConvertEx.ToString(dr[C.ColumnName]));
        }

        /// <summary>
        ///     将资料表中已修改的资料行数据去左右空格、全角转半角
        /// </summary>
        /// <param name="str"></param>
        /// <returns></returns>
        public static string RemoveChar(string str)
        {
            if (string.IsNullOrEmpty(str)) return str;

            try
            {
                var NewStr = string.Empty;
                var c = str.ToCharArray();
                for (var i = 0; i < c.Length; i++)
                {
                    var b = Encoding.Unicode.GetBytes(c, i, 1);

                    if (b.Length == 2)
                    {
                        //全角
                        if (b[1] == 255 || b[1] == 48)
                        {
                            b[0] = (byte)(b[0] + 32);
                            b[1] = 0;
                            NewStr += Encoding.Unicode.GetChars(b)[0];
                        }
                        else
                        {
                            NewStr += c[i];
                        }
                    }
                }

                return NewStr.Trim(); //去左右空格
            }
            catch
            {
                return str;
            }
        }
    }
}