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.capacity. tostring ( "Capacity: # \ n" ); // Capacity: 26 /* Specify capacity and maxcapacity */ Stringbuilder Sb4 = New Stringbuilder (4, 10); STR + = sb4.capacity. tostring ( "Capacity: # \ t" ); // Capacity: 4 Sb4.append ( "1234567890" ); STR + = sb4.capacity. tostring ( "Capacity: # \ n" ); // Capacity: 10 Try {Sb4.append ( "ABC" );} Catch (Exception ERR) {STR + = err. Message + "\ N" ;} // The capacity is smaller than the current size... /* Construct with strings and specify capacity

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First, demand:In order to secure, the project in the foreground login password needs to be encrypted to the background, the background C # decryption login password.Second, the solutionUsing the asymmetric encryption algorithm RSA to achieve the purpose of the front desk landing page A load will send an AJAX request for the background generated public key, for the foreground encryption, the user click on the log on the encryption process and submit encrypted data to the background, the backgroun

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The FB block can be called multiple times by the OB1, and all parameters and static data of the function are stored in a separate data block (DB) that is assigned to the function block, which is referred to as the background data block. When the FB is called, the background data block is automatically opened, the value of the actual parameter is stored in the background data block, and when the block exits, the data in the background data block remains.Below through the case design introduction