The 'Microsoft.Jet.OLEDB.4.0' provider is not registered on the local machine.

报错详情

System.InvalidOperationException: The 'Microsoft.Jet.OLEDB.4.0' provider is not registered on the local machine.

   at System.Data.OleDb.OleDbServicesWrapper.GetDataSource(OleDbConnectionString constr, DataSourceWrapper& datasrcWrapper)

   at System.Data.OleDb.OleDbConnectionInternal..ctor(OleDbConnectionString constr, OleDbConnection connection)

   at System.Data.OleDb.OleDbConnectionFactory.CreateConnection(DbConnectionOptions options, Object poolGroupProviderInfo, DbConnectionPool pool, DbConnection owningObject)

   at System.Data.ProviderBase.DbConnectionFactory.CreateNonPooledConnection(DbConnection owningConnection, DbConnectionPoolGroup poolGroup)

   at System.Data.ProviderBase.DbConnectionFactory.GetConnection(DbConnection owningConnection)

   at System.Data.ProviderBase.DbConnectionClosed.OpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory)

   at System.Data.OleDb.OleDbConnection.Open()

原因及解决方案

用C#读取Excel数据的时候出现错误，把服务器应用程序池设置成允许32位的程序即可。