我同意亚当·拉基斯的观点。SqlBulkCopy是将批量记录从一个数据源传输到另一数据源的最快方法。我用这个复制了20K张唱片，只用了不到3秒钟。看看下面的例子。

public static void InsertIntoMembers(DataTable dataTable)
{           
    using (var connection = new SqlConnection(@"data source=;persist security info=True;user id=;password=;initial catalog=;MultipleActiveResultSets=True;App=EntityFramework"))
    {
        SqlTransaction transaction = null;
        connection.Open();
        try
        {
            transaction = connection.BeginTransaction();
            using (var sqlBulkCopy = new SqlBulkCopy(connection, SqlBulkCopyOptions.TableLock, transaction))
            {
                sqlBulkCopy.DestinationTableName = "Members";
                sqlBulkCopy.ColumnMappings.Add("Firstname", "Firstname");
                sqlBulkCopy.ColumnMappings.Add("Lastname", "Lastname");
                sqlBulkCopy.ColumnMappings.Add("DOB", "DOB");
                sqlBulkCopy.ColumnMappings.Add("Gender", "Gender");
                sqlBulkCopy.ColumnMappings.Add("Email", "Email");

                sqlBulkCopy.ColumnMappings.Add("Address1", "Address1");
                sqlBulkCopy.ColumnMappings.Add("Address2", "Address2");
                sqlBulkCopy.ColumnMappings.Add("Address3", "Address3");
                sqlBulkCopy.ColumnMappings.Add("Address4", "Address4");
                sqlBulkCopy.ColumnMappings.Add("Postcode", "Postcode");

                sqlBulkCopy.ColumnMappings.Add("MobileNumber", "MobileNumber");
                sqlBulkCopy.ColumnMappings.Add("TelephoneNumber", "TelephoneNumber");

                sqlBulkCopy.ColumnMappings.Add("Deleted", "Deleted");

                sqlBulkCopy.WriteToServer(dataTable);
            }
            transaction.Commit();
        }
        catch (Exception)
        {
            transaction.Rollback();
        }

    }
}

〔2019更新〕EF Core 3.1

如上所述，在EF Core中禁用AutoDetectChangesEnabled非常有效：插入时间除以100（从几分钟到几秒，10k条记录具有交叉表关系）

更新的代码为：

context.ChangeTracker.AutoDetectChangesEnabled = false;
foreach (IRecord record in records) {
    //Add records to your database        
}
context.ChangeTracker.DetectChanges();
context.SaveChanges();
context.ChangeTracker.AutoDetectChangesEnabled = true; //do not forget to re-enable

最快的方法是使用批量插入扩展，这是我开发的

注：这是一种商业产品，不是免费的

它使用SqlBulkCopy和自定义数据读取器来获得最大性能。因此，它比使用常规插入或AddRange快20倍以上

用法非常简单

context.BulkInsert(hugeAmountOfEntities);

SqlBulkCopy速度极快

这是我的实现：

// at some point in my calling code, I will call:
var myDataTable = CreateMyDataTable();
myDataTable.Rows.Add(Guid.NewGuid,tableHeaderId,theName,theValue); // e.g. - need this call for each row to insert

var efConnectionString = ConfigurationManager.ConnectionStrings["MyWebConfigEfConnection"].ConnectionString;
var efConnectionStringBuilder = new EntityConnectionStringBuilder(efConnectionString);
var connectionString = efConnectionStringBuilder.ProviderConnectionString;
BulkInsert(connectionString, myDataTable);

private DataTable CreateMyDataTable()
{
    var myDataTable = new DataTable { TableName = "MyTable"};
// this table has an identity column - don't need to specify that
    myDataTable.Columns.Add("MyTableRecordGuid", typeof(Guid));
    myDataTable.Columns.Add("MyTableHeaderId", typeof(int));
    myDataTable.Columns.Add("ColumnName", typeof(string));
    myDataTable.Columns.Add("ColumnValue", typeof(string));
    return myDataTable;
}

private void BulkInsert(string connectionString, DataTable dataTable)
{
    using (var connection = new SqlConnection(connectionString))
    {
        connection.Open();
        SqlTransaction transaction = null;
        try
        {
            transaction = connection.BeginTransaction();

            using (var sqlBulkCopy = new SqlBulkCopy(connection, SqlBulkCopyOptions.TableLock, transaction))
            {
                sqlBulkCopy.DestinationTableName = dataTable.TableName;
                foreach (DataColumn column in dataTable.Columns) {
                    sqlBulkCopy.ColumnMappings.Add(column.ColumnName, column.ColumnName);
                }

                sqlBulkCopy.WriteToServer(dataTable);
            }
            transaction.Commit();
        }
        catch (Exception)
        {
            transaction?.Rollback();
            throw;
        }
    }
}

我正在寻找插入实体框架的最快方法

有一些支持大容量插入的第三方库可用：

Z.EntityFramework.Extensions（推荐）EF实用程序实体框架.BulkInsert

请参见：实体框架大容量插入库

选择大容量插入库时要小心。只有实体框架扩展支持所有类型的关联和继承，并且它是唯一一个仍然受支持的实体框架扩展。

免责声明：我是实体框架扩展的所有者

此库允许您执行场景所需的所有批量操作：

批量保存更改大容量插入批量删除批量更新批量合并

实例

// Easy to use
context.BulkSaveChanges();

// Easy to customize
context.BulkSaveChanges(bulk => bulk.BatchSize = 100);

// Perform Bulk Operations
context.BulkDelete(customers);
context.BulkInsert(customers);
context.BulkUpdate(customers);

// Customize Primary Key
context.BulkMerge(customers, operation => {
   operation.ColumnPrimaryKeyExpression = 
        customer => customer.Code;
});

记下几点，这是我的实施，我的改进以及其他回答和评论。

改进：

从我的实体获取SQL连接字符串仅在某些部分使用SQLBulk，其余部分仅使用实体框架使用与SQL数据库相同的日期表列名，无需映射每个列使用与SQL Datatable相同的Datatable名称public void InsertBulkDatatable（DataTable数据表）{EntityConnectionStringBuilder entityBuilder=新的EntityConnectionStringBuilder（ConfigurationManager.ConnectionStrings[“MyDbContextConnectionName”].ConnectionString）；string cs=entityBuilder.ProviderConnectionString；使用（varconnection=newSqlConnection（cs））{SqlTransaction事务=null；connection.Open（）；尝试{transaction=connection.BegginTransaction（）；使用（var sqlBulkCopy=新的sqlBulkCopy（连接，SqlBulkCopyOptions.TableLock，事务））{sqlBulkCopy.DestinationTableName=dataTable.TableName//使用SQL数据表在c中命名数据表#//映射列foreach（dataTable.Columns中的DataColumn列）{sqlBulkCopy.ColumnMappings.Add（column.ColumnName，column.ColumnName）；}sqlBulkCopy.WriteToServer（数据表）；}transaction.Commit（）；}catch（异常）{transaction.Rollback（）；}}}