void AddColumn(string name, Type type)
{
if (mMap != null && mMap.Editing)
{
try
{
Layer sLayer = (Layer)dataGridView1.Tag;
sLayer.AddField(name, type);
}
catch (Exception ea)
{
MessageBox.Show(ea.Message, "出错");
}
}
}
//读dbf文件
private static void ReadDbf(ref Layer layer, string fileName)
{
int sIndex = fileName.LastIndexOf("\\");
string sName = fileName.Substring(0, fileName.Length - 4) + ".dbf";
//FileStream fs = null;
//BinaryReader br = null;
using (FileStream fs = new FileStream(sName, FileMode.Open, FileAccess.Read))
{
using (BinaryReader br = new BinaryReader(fs))
{
//（1）读文件头
byte Vertion = br.ReadByte(); //版本信息
//更新日期
byte Year = br.ReadByte();
byte Mouth = br.ReadByte();
byte Day = br.ReadByte();
Int32 RecordNum = br.ReadInt32(); //记录条数
Int16 HeadLength = br.ReadInt16(); //文件头字节数
Int16 RecordLength = br.ReadInt16(); //一条记录的字节长度
br.ReadBytes(20); //跳过保留字节、dBASE IV编密码标记、MXD标识等信息
int FieldsCount = (HeadLength - 32) / 32; //表中记录项的个数
Byte[] FieldLength = new Byte[FieldsCount]; //各记录项的长度
for (int i = 0; i < FieldsCount; i++) //读取各个记录项描述信息
{
Byte[] sFieldName = br.ReadBytes(11); //记录项名称
string FieldName = Encoding.GetEncoding("GBK").GetString(sFieldName).Trim(); //将记录项名称转为字符串
Byte FieldType = br.ReadByte(); //记录项数据类型
br.ReadBytes(4); //跳过保留字节
FieldLength[i] = br.ReadByte(); //记录项长度
Byte DemicalCount = br.ReadByte(); //记录项精度
br.ReadBytes(14); //跳过保留字节、工作区ID、MDX标识
if (FieldType == 67) //记录项是字符型
{
layer.AddField(FieldName, typeof(string));
layer.Records.Columns[Layer.FIELD_START_INDEX + i].MaxLength = FieldLength[i];
}
else if (FieldType == 78)//记录项是数值型
{
if (DemicalCount == 0)
{
layer.AddField(FieldName, typeof(Int32));
}
else
{
layer.AddField(FieldName, typeof(double));
}
}
else
{
layer.AddField(FieldName, typeof(string));
layer.Records.Columns[Layer.FIELD_START_INDEX + i].MaxLength = FieldLength[i];
}
}
byte Terminator = br.ReadByte();//记录项终止标识
//（2）读文件记录
Byte[] svalue;
Int32 sint;
Double sdouble;
string str;
for (int i = 0; i < RecordNum; i++) //逐条记录进行读取
{
br.ReadByte(); //每条记录开头是一个空字符
for (int j = 0; j < FieldsCount; j++) //读取记录中的每个记录项
{
svalue = br.ReadBytes(FieldLength[j]);
if (layer.Records.Columns[j + Layer.FIELD_START_INDEX].DataType == typeof(Int32))
{
try
{
str = Encoding.ASCII.GetString(svalue);
if (Int32.TryParse(str, out sint))
{
layer.Records.Rows[i][j + Layer.FIELD_START_INDEX] = sint;
}
}
catch (Exception)//文件中可能有非法字符或浮点数，遇到则不显示或进行转换
{
try
{
str = Encoding.ASCII.GetString(svalue);
if (Double.TryParse(str, out sdouble))
{
layer.Records.Rows[i][j + Layer.FIELD_START_INDEX] = (double)sdouble;
}
}
catch (Exception) { }
}
}
else if (layer.Records.Columns[j + Layer.FIELD_START_INDEX].DataType == typeof(Double))
{
try
{
str = Encoding.ASCII.GetString(svalue);
if (Double.TryParse(str, out sdouble))
{
layer.Records.Rows[i][j + Layer.FIELD_START_INDEX] = sdouble;
}
}
catch (Exception) { }
}
else if (layer.Records.Columns[j + Layer.FIELD_START_INDEX].DataType == typeof(string))
{
layer.Records.Rows[i][j + Layer.FIELD_START_INDEX] = Encoding.GetEncoding("GBK").GetString(svalue).Trim();
}
}
}
}
}
}
