SqlServer数据类型、C#SqlDbType对应关系及转换

// 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;
}
}

// 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;
}