SQL Server类型与C#类型对应关系

SQL类型 C#类型
bit    bool
tinyint    byte
smallint    short
int    int
bigint    long
real    float
float    double
money    decimal
datetime    DateTime
char    string
varchar    string
nchar    string
nvarchar    string
text    string
ntext    string
image    byte[]
binary    byte[]
uniqueidentifier    
Guid
 
//SqlDbType转换为C#数据类型
public static Type SqlType2CsharpType(SqlDbType sqlType)
{
switch (sqlType)
{
case SqlDbType.BigInt:
return typeof(Int64);
case SqlDbType.Binary:
return typeof(Object);
case SqlDbType.Bit:
return typeof(Boolean);
case SqlDbType.Char:
return typeof(String);
case SqlDbType.DateTime:
return typeof(DateTime);
case SqlDbType.Decimal:
return typeof(Decimal);
case SqlDbType.Float:
return typeof(Double);
case SqlDbType.Image:
return typeof(Object);
case SqlDbType.Int:
return typeof(Int32);
case SqlDbType.Money:
return typeof(Decimal);
case SqlDbType.NChar:
return typeof(String);
case SqlDbType.NText:
return typeof(String);
case SqlDbType.NVarChar:
return typeof(String);
case SqlDbType.Real:
return typeof(Single);
case SqlDbType.SmallDateTime:
return typeof(DateTime);
case SqlDbType.SmallInt:
return typeof(Int16);
case SqlDbType.SmallMoney:
return typeof(Decimal);
case SqlDbType.Text:
return typeof(String);
case SqlDbType.Timestamp:
return typeof(Object);
case SqlDbType.TinyInt:
return typeof(Byte);
case SqlDbType.Udt://自定义的数据类型
return typeof(Object);
case SqlDbType.UniqueIdentifier:
return typeof(Object);
case SqlDbType.VarBinary:
return typeof(Object);
case SqlDbType.VarChar:
return typeof(String);
case SqlDbType.Variant:
return typeof(Object);
case SqlDbType.Xml:
return typeof(Object);
default:
return null;
}
}
代码:
// sql server数据类型（如：varchar）
// 转换为SqlDbType类型
public static SqlDbType SqlTypeString2SqlType(string sqlTypeString)
{
SqlDbType dbType = SqlDbType.Variant;//默认为Object

switch (sqlTypeString)
{
case "int":
dbType = SqlDbType.Int;
break;
case "varchar":
dbType = SqlDbType.VarChar;
break;
case "bit":
dbType = SqlDbType.Bit;
break;
case "datetime":
dbType = SqlDbType.DateTime;
break;
case "decimal":
dbType = SqlDbType.Decimal;
break;
case "float":
dbType = SqlDbType.Float;
break;
case "image":
dbType = SqlDbType.Image;
break;
case "money":
dbType = SqlDbType.Money;
break;
case "ntext":
dbType = SqlDbType.NText;
break;
case "nvarchar":
dbType = SqlDbType.NVarChar;
break;
case "smalldatetime":
dbType = SqlDbType.SmallDateTime;
break;
case "smallint":
dbType = SqlDbType.SmallInt;
break;
case "text":
dbType = SqlDbType.Text;
break;
case "bigint":
dbType = SqlDbType.BigInt;
break;
case "binary":
dbType = SqlDbType.Binary;
break;
case "char":
dbType = SqlDbType.Char;
break;
case "nchar":
dbType = SqlDbType.NChar;
break;
case "numeric":
dbType = SqlDbType.Decimal;
break;
case "real":
dbType = SqlDbType.Real;
break;
case "smallmoney":
dbType = SqlDbType.SmallMoney;
break;
case "sql_variant":
dbType = SqlDbType.Variant;
break;
case "timestamp":
dbType = SqlDbType.Timestamp;
break;
case "tinyint":
dbType = SqlDbType.TinyInt;
break;
case "uniqueidentifier":
dbType = SqlDbType.UniqueIdentifier;
break;
case "varbinary":
dbType = SqlDbType.VarBinary;
break;
case "xml":
dbType = SqlDbType.Xml;
break;
}
return dbType;
}
代码:
// sql server中的数据类型，转换为C#中的类型类型
public static Type SqlTypeString2CsharpType(string sqlTypeString)
{
SqlDbType dbTpe = SqlTypeString2SqlType(sqlTypeString);

return SqlType2CsharpType(dbTpe);
}

// 将sql server中的数据类型，转化为C#中的类型的字符串
public static string SqlTypeString2CsharpTypeString(string sqlTypeString)
{
Type type = SqlTypeString2CsharpType(sqlTypeString);

return type.Name;
}