我还需要能够传递表值参数和常规参数。结合@Esen 和@Roger-Joys 的答案给了我下面的课程。此类专门针对使用 stringlist_to_table 类型，但您可以更改它以满足您的需要。对我来说，为您要处理的每种 TVP 类型制定一个特定的方法似乎是有意义的。
CREATE TYPE stringlist_tbltype AS TABLE (s VARCHAR(256))
用法：
var p = new DynamicParametersWithTVP();
p.Add( "@someVar", "abc", DbType.AnsiString );
p.AddTVPString( "@stringlist", new string[] { "abc", "def" } );
using (var conn = new SqlConnection( _cs )) {
conn.Open();
return conn.Query( "dbo.stored_proc_name", p, commandType: CommandType.StoredProcedure );
}
下面是 DynamicParametersWithTVP 的实现。它基本上保留了一个 DynamicParameters 类来处理非 TVP 的东西，以及 TVP 的构建。
class DynamicParametersWithTVP : SqlMapper.IDynamicParameters
{
private Dictionary<string, TVPData> _tvpParams;
private DynamicParameters _params;
public DynamicParametersWithTVP()
{
_tvpParams = new Dictionary<string, TVPData>();
_params = new DynamicParameters();
}
public void Add( string name, object value = null, DbType? dbType = null, ParameterDirection? direction = null, int? size = null )
{
_params.Add( name, value, dbType, direction, size );
}
public void AddTVPString( string name, IEnumerable<string> values )
{
var metadata = new[] {
new SqlMetaData( "one", SqlDbType.VarChar, 256)
};
var data = new TVPData
{
Data = values,
MetaData = metadata,
Name = name,
Type = "stringlist_tbltype",
SetData = ( rec, s ) => rec.SetString( 0, (string)s ),
};
_tvpParams.Add( name, data );
}
public void AddParameters( IDbCommand command, SqlMapper.Identity identity )
{
//Adds the regular parameters, then adds any tvp parameters
((SqlMapper.IDynamicParameters)_params).AddParameters( command, identity );
AddTVPCommands( command );
}
private void AddTVPCommands( IDbCommand command )
{
foreach (var o in _tvpParams) {
AddTVPParam( command, o.Key, o.Value );
}
}
private void AddTVPParam( IDbCommand command, string name, TVPData value )
{
var dataList = new List<SqlDataRecord>();
if (value.Data != null) {
foreach (var d in value.Data) {
var rec = new SqlDataRecord( value.MetaData );
value.SetData( rec, d ); //note: this only works for a one-column TVP
dataList.Add( rec );
}
}
if (dataList.Count == 0) { //gotta make the value null if there isn't any data.
dataList = null;
}
var p = ((SqlCommand)command).Parameters.Add( name, SqlDbType.Structured );
p.Direction = ParameterDirection.Input;
p.TypeName = value.Type;
p.Value = dataList;
}
private class TVPData
{
public string Name { get; set; }
public string Type { get; set; }
public SqlMetaData[] MetaData { get; set; }
public IEnumerable Data { get; set; }
public Action<SqlDataRecord, object> SetData { get; set; }
}
}