133 lines
4.7 KiB
C#
133 lines
4.7 KiB
C#
using System;
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using System.ComponentModel;
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using System.Data;
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namespace AIMSExtension
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{
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public class TypeHelper
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{
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public static Type ConvertTypeToBaseType(Type t)
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{
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//判断convertsionType类型是否为泛型，因为nullable是泛型类,
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//判断convertsionType是否为nullable泛型类
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if (t.IsGenericType &&( t.GetGenericTypeDefinition().Equals(typeof(Nullable<>))|| t.GetGenericTypeDefinition().Equals(typeof(DBNull))))
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{
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//如果convertsionType为nullable类，声明一个NullableConverter类，该类提供从Nullable类到基础基元类型的转换
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NullableConverter nullableConverter = new NullableConverter(t);
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//将convertsionType转换为nullable对的基础基元类型
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t = nullableConverter.UnderlyingType;
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}
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return t;
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}
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public static object GetDefalutValue(Type t)
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{
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if (t.IsGenericType && t.GetGenericTypeDefinition().Equals(typeof(Nullable<>)))
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{
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return null;
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}
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var code = Type.GetTypeCode(t);
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switch (code)
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{
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case TypeCode.Boolean:
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return default(bool);
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case TypeCode.Byte:
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return default(byte);
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case TypeCode.DateTime:
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return default(DateTime);
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case TypeCode.Decimal:
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return default(decimal);
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case TypeCode.Double:
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return default(double);
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case TypeCode.Int16:
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return default(Int16);
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case TypeCode.Int32:
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return default(Int32);
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case TypeCode.Int64:
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return default(Int64);
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case TypeCode.SByte:
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return default(SByte);
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case TypeCode.Single:
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return default(Single);
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case TypeCode.String:
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return default(String);
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case TypeCode.UInt16:
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return default(UInt16);
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case TypeCode.UInt32:
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return default(UInt32);
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case TypeCode.UInt64:
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return default(UInt64);
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case TypeCode.Object:
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return null;
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default:
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return null;
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}
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}
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public static SqlDbType ConvertTypeToSqlDbType(Type t)
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{
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//判断convertsionType类型是否为泛型，因为nullable是泛型类,
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//判断convertsionType是否为nullable泛型类
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if (t.IsGenericType && t.GetGenericTypeDefinition().Equals(typeof(Nullable<>)))
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{
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//如果convertsionType为nullable类，声明一个NullableConverter类，该类提供从Nullable类到基础基元类型的转换
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NullableConverter nullableConverter = new NullableConverter(t);
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//将convertsionType转换为nullable对的基础基元类型
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t = nullableConverter.UnderlyingType;
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}
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var code = Type.GetTypeCode(t);
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switch (code)
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{
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case TypeCode.Boolean:
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return SqlDbType.Bit;
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case TypeCode.Byte:
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return SqlDbType.TinyInt;
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case TypeCode.DateTime:
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return SqlDbType.DateTime;
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case TypeCode.Decimal:
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return SqlDbType.Decimal;
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case TypeCode.Double:
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return SqlDbType.Float;
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case TypeCode.Int16:
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return SqlDbType.SmallInt;
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case TypeCode.Int32:
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return SqlDbType.Int;
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case TypeCode.Int64:
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return SqlDbType.BigInt;
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case TypeCode.SByte:
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return SqlDbType.TinyInt;
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case TypeCode.Single:
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return SqlDbType.Real;
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case TypeCode.String:
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return SqlDbType.NVarChar;
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case TypeCode.UInt16:
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return SqlDbType.SmallInt;
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case TypeCode.UInt32:
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return SqlDbType.Int;
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case TypeCode.UInt64:
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return SqlDbType.BigInt;
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case TypeCode.Object:
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return SqlDbType.Variant;
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default:
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if (t == typeof(byte[]))
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{
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return SqlDbType.Binary;
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}
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return SqlDbType.Variant;
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}
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}
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}
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}
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