关于excel：如何使用C＃和OleDbConnection读取.xlsx和.xls文件？

How to read .xlsx and .xls files using C# and OleDbConnection?

以前我用ExcelPackage从.xlsx文件中读取数据。这很好，但后来我意识到ExcelPackage不适用于旧的.xls格式。所以我升级到使用OleDbConnection而不是ExcelPackage，就像这样：

1
2
3
4
5
6
7
8
9
10
11
12
13

var file = HttpContext.Current.Request.Files[0];
DataTable sheetData = new DataTable();
string connStr ="Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" +
file.FileName +"; Jet OLEDB:Engine Type=5;Extended Properties="Excel 8.0;"";

using (OleDbConnection conn = new OleDbConnection(connStr))
{
conn.Open();
DataTable dtSchema = conn.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, new object[] { null, null, null,"TABLE" });
string sheetName = dtSchema.Rows[0].Field("TABLE_NAME");
OleDbDataAdapter sheetAdapter = new OleDbDataAdapter("select * from [" + sheetName +"]", conn);
sheetAdapter.Fill(sheetData);
}

基本上只是试着读第一个电子表格。但我在例外中得到了这个错误：

Cannot update. Database or object is read-only.

我做错什么了？是否隐藏了某种更新操作？

相关讨论

试试这个：

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33

OleDbConnection connection;
OleDbCommand command;
OleDbDataReader dr;

string commandText ="SELECT * FROM [Sheet1$]";
string oledbConnectString ="Provider=Microsoft.ACE.OLEDB.12.0;" +
@"Data Source=" + filename +";" +
"Extended Properties="Excel 12.0;HDR=YES";";
connection = new OleDbConnection(oledbConnectString);
command = new OleDbCommand(commandText, connection);

try
{
connection.Open();
dr = command.ExecuteReader();

while (dr.Read())
{
count++;

for (int i = 1; i < dr.VisibleFieldCount; i++)
{
Console.Writeln(""+dr[i].ToString());
}
}

connection.Close();
}
catch (Exception ex)
{
MessageBox.Show("" + ex.Message);
connection.Close();
}

相关讨论

下面是从给定的excel文件路径返回DataSet的示例方法。返回的DataSet应将工作簿中的每个excel工作表作为DataSet中的DataTable工作表。这似乎工作正常，希望能有所帮助。

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26

private DataSet GetExcelDataSet(string path) {
string sheetName;
string ConnectionString = @"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + path +
"; Jet OLEDB:Engine Type = 5; Extended Properties ="Excel 8.0;"";
DataSet ds = new DataSet();
using (OleDbConnection con = new OleDbConnection(ConnectionString)) {
using (OleDbCommand cmd = new OleDbCommand()) {
using (OleDbDataAdapter oda = new OleDbDataAdapter()) {
cmd.Connection = con;
con.Open();
DataTable dtExcelSchema = con.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, null);
for (int i = 0; i < dtExcelSchema.Rows.Count; i++) {
sheetName = dtExcelSchema.Rows[i]["TABLE_NAME"].ToString();
DataTable dt = new DataTable(sheetName);
cmd.Connection = con;
cmd.CommandText ="SELECT * FROM [" + sheetName +"]";
oda.SelectCommand = cmd;
oda.Fill(dt);
dt.TableName = sheetName;
ds.Tables.Add(dt);
}
}
}
}
return ds;
}