[英]Convert SqlCommand Output to List<MyType>?
I am using an ADO.NET SqlCommand with a single SqlDbType.Structured parameter to send a table-valued parameter to a sproc. 我正在使用带有单个SqlDbType.Structured参数的ADO.NET SqlCommand将表值参数发送到sproc。 The sproc returns many rows, which I need to get into a strongly-Typed List of .
sproc返回许多行,我需要进入强类型列表。 What is the best way to convert the result set (whether DataTable from a DataAdapter or DataReader bits) into List?
将结果集(DataTable是否从DataAdapter或DataReader位转换)到List中的最佳方法是什么?
Thanks. 谢谢。
You can use LINQ with a DataReader: 您可以将LINQ与DataReader一起使用:
var list = reader.Cast<IDataRecord>()
.Select(dr => new YourType { Name = dr.GetString(0), ... })
.ToList();
The most efficient way is using datareader: 最有效的方法是使用datareader:
var items = new LinkedList<MyClass>();
using(var connection = GetConnection()) {
using(var cmd = connection.CreateCommand()){
cmd.CommandText = "... your SQL statement ...";
// ... add parameters
cnn.Open();
using(var reader = cmd.ExecuteReader()) {
// accessing values via number index is most efficient
//gets index of column with name "PrimaryKey"
var ndxPrimaryKey = reader.GetOrdinal("PrimaryKey");
var ndxColumn1 = reader.GetOrdinal("Column1");
var ndxColumn2 = reader.GetOrdinal("Column2");
while(reader.Read()) {
var item = new MyClass();
// returns value of column "PrimaryKey" typed to nullable Guid
item.PrimaryKey = reader.GetValue(ndxPrimaryKey) as Guid?;
item.Column1 = reader.GetValue(ndxColumn1) as string;
item.Column2 = reader.GetValue(ndxColumn2) as int?;
items.AddLast(item);
}
}
cnn.Close();
}
}
return items;
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.