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Showing content from https://learn.microsoft.com/en-us/dotnet/framework/data/adonet/oracle-data-type-mappings below:

Oracle Data Type Mappings - ADO.NET

Oracle Data Type Mappings

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The following table lists Oracle data types and their mappings to the OracleDataReader.

The following table lists Oracle data types and the .NET Framework data types (System.Data.DbType and OracleType) to use when binding them as parameters.

Oracle data type DbType enumeration to bind as a parameter OracleType enumeration to bind as a parameter Remarks BFILE BFile Oracle only allows binding a BFILE as a BFILE parameter. The .NET Data Provider for Oracle does not automatically construct one for you if you attempt to bind a non-BFILE value, such as byte[] or OracleBinary. BLOB Blob Oracle only allows binding a BLOB as a BLOB parameter. The .NET Data Provider for Oracle does not automatically construct one for you if you attempt to bind a non-BLOB value, such as byte[] or OracleBinary. CHAR AnsiStringFixedLength Char CLOB Clob Oracle only allows binding a CLOB as a CLOB parameter. The .NET Data Provider for Oracle does not automatically construct one for you if you attempt to bind a non-CLOB value, such as System.String or OracleString. DATE DateTime DateTime FLOAT Single, Double, Decimal Float, Double, Number Size determines the System.Data.DBType and OracleType. INTEGER SByte, Int16, Int32, Int64, Decimal SByte, Int16, Int32, Number Size determines the System.Data.DBType and OracleType. INTERVAL YEAR TO MONTH Int32 IntervalYearToMonth OracleType is only available when using both Oracle 9i client and server software. INTERVAL DAY TO SECOND Object IntervalDayToSecond OracleType is only available when using both Oracle 9i client and server software. LONG AnsiString LongVarChar LONG RAW Binary LongRaw NCHAR StringFixedLength NChar NCLOB NClob Oracle only allows binding a NCLOB as a NCLOB parameter. The .NET Data Provider for Oracle does not automatically construct one for you if you attempt to bind a non-NCLOB value, such as System.String or OracleString. NUMBER VarNumeric Number NVARCHAR2 String NVarChar RAW Binary Raw REF CURSOR Cursor For more information, see Oracle REF CURSORs. ROWID AnsiString Rowid TIMESTAMP DateTime Timestamp OracleType is only available when using both Oracle 9i client and server software. TIMESTAMP WITH LOCAL TIME ZONE DateTime TimestampLocal OracleType is only available when using both Oracle 9i client and server software. TIMESTAMP WITH TIME ZONE DateTime TimestampWithTz OracleType is only available when using both Oracle 9i client and server software. UNSIGNED INTEGER Byte, UInt16, UInt32, UInt64, Decimal Byte, UInt16, Uint32, Number Size determines the System.Data.DBType and OracleType. VARCHAR2 AnsiString VarChar

The InputOutput, Output, and ReturnValue ParameterDirection values used by the Value property of the OracleParameter object are .NET Framework data types, unless the input value is an Oracle data type (for example, OracleNumber or OracleString). This does not apply to REF CURSOR, BFILE, or LOB data types.