75 lines
2.7 KiB
C#
75 lines
2.7 KiB
C#
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// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information.
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using System;
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using System.Collections.Generic;
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using System.Data.Spatial;
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using System.Data.SqlClient;
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using System.Data.SqlTypes;
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using System.IO;
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using System.Linq;
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using System.Reflection;
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using System.Text;
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using System.Threading.Tasks;
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namespace SampleEntityFrameworkProvider
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{
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internal sealed class SqlSpatialDataReader : DbSpatialDataReader
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{
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private readonly SqlDataReader reader;
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static SqlSpatialDataReader()
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{
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}
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public SqlSpatialDataReader(SqlDataReader underlyingReader)
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{
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this.reader = underlyingReader;
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}
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public override DbGeography GetGeography(int ordinal)
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{
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EnsureGeographyColumn(ordinal);
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var geographyBytes = this.reader.GetSqlBytes(ordinal);
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dynamic geography = Activator.CreateInstance(SqlTypes.SqlGeographyType);
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geography.Read(new BinaryReader(geographyBytes.Stream));
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return SpatialServices.Instance.GeographyFromProviderValue(geography);
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}
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public override DbGeometry GetGeometry(int ordinal)
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{
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EnsureGeometryColumn(ordinal);
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var geometryBytes = this.reader.GetSqlBytes(ordinal);
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dynamic geometry = Activator.CreateInstance(SqlTypes.SqlGeometryType);
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geometry.Read(new BinaryReader(geometryBytes.Stream));
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return SpatialServices.Instance.GeometryFromProviderValue(geometry);
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}
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private void EnsureGeographyColumn(int ordinal)
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{
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string fieldTypeName = this.reader.GetDataTypeName(ordinal);
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if (!fieldTypeName.EndsWith("sys.geography", StringComparison.Ordinal)) // Use EndsWith so that we just see the schema and type name, not the database name.
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{
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throw new InvalidOperationException(
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string.Format(
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"Expected a geography value, found a value of type {0}.",
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fieldTypeName));
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}
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}
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private void EnsureGeometryColumn(int ordinal)
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{
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string fieldTypeName = this.reader.GetDataTypeName(ordinal);
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if (!fieldTypeName.EndsWith("sys.geometry", StringComparison.Ordinal)) // Use EndsWith so that we just see the schema and type name, not the database name.
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{
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throw new InvalidOperationException(
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string.Format(
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"Expected a geometry value, found a value of type {0}.",
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fieldTypeName));
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}
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}
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}
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}
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