sql-C#-類型對應

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轉換爲C#數據類型
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://自定義的數據類型
         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;
 }
 } 
複製內容到剪貼板 
代碼:
// sql server數據類型（如：varchar）
// 轉換爲SqlDbType類型
public static SqlDbType SqlTypeString2SqlType(string sqlTypeString)
 {
 SqlDbType dbType = SqlDbType.Variant;//默認爲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;
 }
複製內容到剪貼板 
代碼:

// sql server中的數據類型，轉換爲C#中的類型類型
public static Type SqlTypeString2CsharpType(string sqlTypeString)
 {
 SqlDbType dbTpe = SqlTypeString2SqlType(sqlTypeString);

 return SqlType2CsharpType(dbTpe);
 }

 // 將sql server中的數據類型，轉化爲C#中的類型的字符串
public static string SqlTypeString2CsharpTypeString(string sqlTypeString)
 {
 Type type = SqlTypeString2CsharpType(sqlTypeString);

 return type.Name;
 }