Microsoft.Data.SqlClient.SqlBulkCopy 的两个构造函数之间有什么区别吗？

Question

Microsoft.Data.SqlClient.SqlBulkCopy类型有四个构造函数：

public SqlBulkCopy(SqlConnection connection);
public SqlBulkCopy(string connectionString);
public SqlBulkCopy(string connectionString, SqlBulkCopyOptions copyOptions);
public SqlBulkCopy(SqlConnection connection, SqlBulkCopyOptions copyOptions, SqlTransaction externalTransaction);

调用public SqlBulkCopy("someConnectionString")和调用public SqlBulkCopy("someConnectionString", SqlBulkCopyOptions.Default)有什么区别吗？

Answer 1

不，没有区别。

字段 _copyOptions 没有设置值：https://github.com/dotnet/SqlClient/blob/master/src/Microsoft.Data.SqlClient/netcore/src/Microsoft/Data/SqlClient/SqlBulkCopy.cs#L183

表示默认值为0（相当于SqlBulkCopyOptions.Default）：https://github.com/dotnet/SqlClient/blob/master/src/Microsoft.Data.SqlClient/src/Microsoft/Data/SqlClient/SqlBulkCopyOptions.cs#L14

构造函数public SqlBulkCopy(string connectionString, SqlBulkCopyOptions copyOptions);调用public SqlBulkCopy(string connectionString);构造函数并设置_copyOptions字段：https://github.com/dotnet/SqlClient/blob/master/src/Microsoft.Data.SqlClient/netcore/src/Microsoft/Data/SqlClient/SqlBulkCopy.cs#L309

所以你会得到完全相同的行为

Microsoft.Data.SqlClient.SqlBulkCopy 的两个构造函数之间有什么区别吗？

Is there any difference between two constructors of the Microsoft.Data.SqlClient.SqlBulkCopy?

sqlbulkcopy

sqlclient