获取数据库架构信息，GetSchema（），参数表

哎，挺好的方法，可惜msdn上没有详细的参数表，只能自己写了。。。

CollectionName

MetaDataCollections

DataSourceInformation

DataTypes

Restrictions

ReservedWords

Users

Databases

Tables

Columns

StructuredTypeMembers

Views

ViewColumns

ProcedureParameters

Procedures

ForeignKeys

IndexColumns

Indexes

UserDefinedTypes

    private DataTable GetSqlDatabaseSchema(string strConn, string collectionName,string[] strs)
    {
        SqlConnection connection = new SqlConnection(strConn);
        DataTable schema = new DataTable();
        try
        {
            connection.Open();
            if (!string.IsNullOrEmpty(collectionName))
            {
                if (strs != null&&strs.Length >0)
                {
                    schema = connection.GetSchema(collectionName, strs);
                }
                else
                schema = connection.GetSchema(collectionName);
            }
            else
                schema = connection.GetSchema();
        }
        catch
        {
            schema = null;
        }
        finally
        {
            connection.Close();
        }
        return schema;
    }